| ferrocerium | (noun) a pyrophoric alloy of iron with cerium; used for lighter flints | - |
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| ferromagnetism | (noun) phenomenon exhibited by materials like iron (nickel or cobalt) that become magnetized in a magnetic field and retain their magnetism when the field is removed | - |
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| fetichism | (noun) sexual arousal or gratification resulting from handling a fetish (or a specific part of the body other than the sexual organs) | Synonyms: fetishism |
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| (noun) a belief in the magical power of fetishes (or the worship of a fetish) | Synonyms: fetishism |
| fetishism | (noun) sexual arousal or gratification resulting from handling a fetish (or a specific part of the body other than the sexual organs) | Synonyms: fetichism |
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| (noun) a belief in the magical power of fetishes (or the worship of a fetish) | Synonyms: fetichism |
| feudalism | (noun) the social system that developed in Europe in the 8th century; vassals were protected by lords who they had to serve in war | Synonyms: feudal system |
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| fiefdom | (noun) an organization that is controlled by a dominant person or group | - |
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| (noun) the domain controlled by a feudal lord | - |
| filiform | (adjective) thin in diameter; resembling a thread | Synonyms: filamentlike, filamentous, threadlike, thready |
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| film | (noun) a thin coating or layer | - |
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| (noun) photographic material consisting of a base of celluloid covered with a photographic emulsion; used to make negatives or transparencies | Synonyms: photographic film |
| (noun) a thin sheet of (usually plastic and usually transparent) material used to wrap or cover things | Synonyms: plastic film |
| (noun) a medium that disseminates moving pictures | Synonyms: celluloid, cinema |
| (noun) a form of entertainment that enacts a story by sound and a sequence of images giving the illusion of continuous movement | Synonyms: flick, motion-picture show, motion picture, movie, moving-picture show, moving picture, pic, picture, picture show |
| (verb) make a film or photograph of something | Synonyms: shoot, take |
| (verb) record in film | - |
| filmdom | (noun) the personnel of the film industry | Synonyms: screen, screenland |
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| filum | (noun) a threadlike structure (as a chainlike series of cells) | Synonyms: filament |
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| findom | (noun) pejorative term for when a man gives money to a woman | - |
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| (noun) a fetish where the submissive is forced to give money to a dominant | - |
| firearm | (noun) a portable gun | Synonyms: piece, small-arm |
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| fireroom | (noun) (nautical) chamber or compartment in which the furnaces of a ship are stoked or fired | Synonyms: stokehold, stokehole |
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| firestorm | (noun) an outburst of controversy | - |
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| (noun) a storm in which violent winds are drawn into the column of hot air rising over a severely bombed area | - |
| firm | (adjective) unwavering in devotion to friend or vow or cause | Synonyms: fast, loyal, truehearted |
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| (adjective) securely fixed in place | Synonyms: fast, immobile |
| (adjective) strong and sure | Synonyms: strong |
| (adjective) not soft or yielding to pressure | Synonyms: solid |
| (adjective) possessing the tone and resiliency of healthy tissue | - |
| (adjective) marked by firm determination or resolution; not shakable | Synonyms: steadfast, steady, stiff, unbendable, unfaltering, unshakable, unwavering |
| (adjective) securely established | - |
| (adjective) not subject to revision or change | - |
| (adjective) (of especially a person's physical features) not shaking or trembling | - |
| (adjective) not liable to fluctuate or especially to fall | Synonyms: steady, unfluctuating |
| (noun) the members of a business organization that owns or operates one or more establishments | Synonyms: business firm, house |
| (adverb) with resolute determination | Synonyms: firmly, steadfastly, unwaveringly |
| (verb) become taut or tauter | Synonyms: tauten |
| (verb) make taut or tauter | Synonyms: tauten |
| fishworm | (noun) terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers | Synonyms: angleworm, crawler, dew worm, earthworm, fishing worm, nightcrawler, nightwalker, red worm, wiggler |
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| flagellum | (noun) a lash-like appendage used for locomotion (e.g., in sperm cells and some bacteria and protozoa) | - |
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| (noun) a whip used to inflict punishment | Synonyms: scourge |
| flatbottom | (adjective) having a flat bottom | Synonyms: flat-bottom, flat-bottomed, flatbottomed |
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| flatworm | (noun) parasitic or free-living worms having a flattened body | Synonyms: platyhelminth |
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| flerovium | (noun) a radioactive transuranic element | Synonyms: Fl |
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| flexitarianism | (noun) The practice of eating mainly vegetarian food, but making occasional exceptions for social, pragmatic, cultural, or nutritional reasons. | Synonyms: semi-vegetarianism |
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| flimflam | (noun) a swindle in which you cheat at gambling or persuade a person to buy worthless property | Synonyms: bunco, bunco game, bunko, bunko game, con, con game, confidence game, confidence trick, hustle, sting |
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| flipagram | (noun) a sequence of photos composed into a video | - |
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| florilegium | (noun) an anthology of short literary pieces and poems and ballads etc. | Synonyms: garland, miscellany |
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| flotsam | (noun) the floating wreckage of a ship | Synonyms: jetsam |
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| fluidram | (noun) a unit of capacity or volume in the apothecary system equal to one eighth of a fluid ounce | Synonyms: drachm, fluid drachm, fluid dram |
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| (noun) a British imperial capacity measure (liquid or dry) equal to 60 minims or 3.5516 cubic centimeters | Synonyms: drachm, fluid drachm, fluid dram |
| flunitrazepam | (noun) a depressant and tranquilizer (trade name Rohypnol) often used in the commission of sexual assault; legally available in Europe and Mexico and Colombia | Synonyms: Rohypnol |
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| fluoroform | (noun) colorless gas haloform CHF3 (similar to chloroform) | Synonyms: trifluoromethane |
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| flurazepam | (noun) tranquilizer (trade name Dalmane) used to treat insomnia | Synonyms: Dalmane, flurazepam hydrochloride |
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| foam | (noun) a mass of small bubbles formed in or on a liquid | Synonyms: froth |
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| (noun) a lightweight material in cellular form; made by introducing gas bubbles during manufacture | - |
| (verb) become bubbly or frothy or foaming | Synonyms: effervesce, fizz, form bubbles, froth, sparkle |
| folium | (noun) a thin layer or stratum of (especially metamorphic) rock | - |
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| folklorism | (noun) Invention or adaptation of folklore; including any use of a tradition outside the cultural context in which it was created. | - |
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| foodgasm | (noun) An extreme feeling of pleasure caused by seeing food | - |
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| foram | (noun) marine microorganism having a calcareous shell with openings where pseudopods protrude | Synonyms: foraminifer |
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| forearm | (noun) the part of the superior limb between the elbow and the wrist | - |
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| (verb) arm in advance of a confrontation | - |
| foredoom | (verb) doom beforehand | - |
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| form | (noun) the spatial arrangement of something as distinct from its substance | Synonyms: shape |
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| (noun) a life-size dummy used to display clothes | Synonyms: manakin, manikin, mannequin, mannikin |
| (noun) a mold for setting concrete | - |
| (noun) the visual appearance of something or someone | Synonyms: cast, shape |
| (noun) any spatial attributes (especially as defined by outline) | Synonyms: configuration, conformation, contour, shape |
| (noun) an ability to perform well | - |
| (noun) a particular mode in which something is manifested | - |
| (noun) alternative names for the body of a human being | Synonyms: anatomy, bod, build, chassis, figure, flesh, frame, human body, material body, physical body, physique, shape, soma |
| (noun) a perceptual structure | Synonyms: pattern, shape |
| (noun) a category of things distinguished by some common characteristic or quality | Synonyms: kind, sort, variety |
| (noun) the phonological or orthographic sound or appearance of a word that can be used to describe or identify something | Synonyms: descriptor, signifier, word form |
| (noun) a printed document with spaces in which to write | - |
| (noun) an arrangement of the elements in a composition or discourse | - |
| (noun) a body of students who are taught together | Synonyms: class, course, grade |
| (noun) (biology) a group of organisms within a species that differ in trivial ways from similar groups | Synonyms: strain, var., variant |
| (noun) (physical chemistry) a distinct state of matter in a system; matter that is identical in chemical composition and physical state and separated from other material by the phase boundary | Synonyms: phase |
| (verb) give shape or form to | Synonyms: shape |
| (verb) assume a form or shape | - |
| (verb) make something, usually for a specific function | Synonyms: forge, mold, mould, shape, work |
| (verb) create (as an entity) | Synonyms: organise, organize |
| (verb) establish or impress firmly in the mind | Synonyms: imprint |
| (verb) to compose or represent | Synonyms: constitute, make |
| (verb) develop into a distinctive entity | Synonyms: spring, take form, take shape |
| formalism | (noun) the practice of scrupulous adherence to prescribed or external forms | - |
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| (noun) (philosophy) the philosophical theory that formal (logical or mathematical) statements have no meaning but that its symbols (regarded as physical entities) exhibit a form that has useful applications | - |
| (noun) the doctrine that formal structure rather than content is what should be represented | - |
| forum | (noun) a public facility to meet for open discussion | Synonyms: assembly, meeting place |
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| (noun) a public meeting or assembly for open discussion | - |
| francium | (noun) a radioactive element of the alkali-metal group discovered as a disintegration product of actinium | Synonyms: atomic number 87, Fr |
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| freedom | (noun) the condition of being free; the power to act or speak or think without externally imposed restraints | - |
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| (noun) immunity from an obligation or duty | Synonyms: exemption |
| frustum | (noun) a truncated cone or pyramid; the part that is left when a cone or pyramid is cut by a plane parallel to the base and the apical part is removed | - |
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| fthm | (noun) a linear unit of measurement (equal to 6 feet) for water depth | Synonyms: fathom |
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| (noun) (mining) a unit of volume (equal to 6 cubic feet) used in measuring bodies of ore | Synonyms: fathom |
| fulcrum | (noun) the pivot about which a lever turns | - |
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| funambulism | (noun) walking on a tightrope or slack rope | Synonyms: tightrope walking |
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| functionalism | (noun) a psychology based on the assumption that all mental process are useful to an organism in adapting to the environment | - |
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| (noun) any doctrine that stresses utility or purpose | - |
| fundamentalism | (noun) a form of Protestantism that takes the interpretation of every word in the sacred texts as literal truth | - |
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| (noun) the strict adherence to the basic principles or doctrines of a religion, ideology, etc. | - |
| fusiform | (adjective) tapering at each end | Synonyms: cigar-shaped, spindle-shaped |
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| futurism | (noun) the position that the meaning of life should be sought in the future | - |
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| (noun) an artistic movement in Italy around 1910 that tried to express the energy and values of the machine age | - |
| gadolinium | (noun) a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group | Synonyms: atomic number 64, Gd |
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| galbanum | (noun) a bitter aromatic gum resin that resembles asafetida | Synonyms: gum albanum |
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| gallium | (noun) a rare silvery (usually trivalent) metallic element; brittle at low temperatures but liquid above room temperature; occurs in trace amounts in bauxite and zinc ores | Synonyms: atomic number 31, Ga |
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| galvanism | (noun) the therapeutic application of electricity to the body (as in the treatment of various forms of paralysis) | Synonyms: electric healing, electrical healing, electrotherapy |
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| (noun) electricity produced by chemical action | - |
| gam | (noun) a herd of whales | - |
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| gametangium | (noun) cell or organ in which gametes develop | - |
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| gametoecium | (noun) gametangia and surrounding bracts | - |
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| gangdom | (noun) underworld organizations | Synonyms: gangland, organized crime |
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| gargoylism | (noun) hereditary disease (autosomal recessive) consisting of an error is mucopolysaccharide metabolism; characterized by severe abnormalities in development of skeletal cartilage and bone and mental retardation | Synonyms: dysostosis multiplex, Hurler's disease, Hurler's syndrome, lipochondrodystrophy |
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| gastrolobium | (noun) any of various Australian evergreen shrubs of the genus Gastrolobium having whorled compound leaves poisonous to livestock and showy yellow to deep reddish-orange flowers followed by two-seeded pods | Synonyms: poison bush, poison pea |
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| gem | (noun) a precious or semiprecious stone incorporated into a piece of jewelry | Synonyms: jewel, precious stone |
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| (noun) art highly prized for its beauty or perfection | Synonyms: treasure |
| (noun) a sweet quick bread baked in a cup-shaped pan | Synonyms: muffin |
| (noun) a person who is as brilliant and precious as a piece of jewelry | Synonyms: jewel |
| (noun) a crystalline rock that can be cut and polished for jewelry | Synonyms: gemstone, stone |
| geneticism | (noun) the belief that all human characteristics are determined genetically | - |
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| geotropism | (noun) an orienting response to gravity | - |
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| geranium | (noun) any of numerous plants of the family Geraniaceae | - |
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| germ | (noun) a minute life form (especially a disease-causing bacterium); the term is not in technical use | Synonyms: bug, microbe |
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| (noun) a small apparently simple structure (as a fertilized egg) from which new tissue can develop into a complete organism | - |
| (noun) anything that provides inspiration for later work | Synonyms: seed, source |
| germanium | (noun) a brittle grey crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors; occurs in germanite and argyrodite | Synonyms: atomic number 32, Ge |
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| giantism | (noun) excessive largeness of stature | Synonyms: gigantism |
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| (noun) excessive size; usually caused by excessive secretion of growth hormone from the pituitary gland | Synonyms: gigantism, overgrowth |
| gigantism | (noun) excessive largeness of stature | Synonyms: giantism |
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| (noun) excessive size; usually caused by excessive secretion of growth hormone from the pituitary gland | Synonyms: giantism, overgrowth |
| gingham | (noun) a clothing fabric in a plaid weave | - |
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| gleam | (noun) an appearance of reflected light | Synonyms: gleaming, glow, lambency |
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| (noun) a flash of light (especially reflected light) | Synonyms: gleaming, glimmer |
| (verb) to shine with faint or brief light | - |
| (verb) shine brightly, like a star or a light | Synonyms: glimmer |
| (verb) be shiny, as if wet | Synonyms: glint, glisten, glitter, shine |
| gloam | (noun) the time of day immediately following sunset | Synonyms: crepuscle, crepuscule, dusk, evenfall, fall, gloaming, nightfall, twilight |
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| glochidium | (noun) a barbed spine or bristle (often tufted on cacti) | Synonyms: glochid |
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| glom | (verb) take by theft | Synonyms: cop, hook, knock off, snitch, thieve |
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| (verb) seize upon or latch onto something | - |
| gloom | (noun) a feeling of melancholy apprehension | Synonyms: gloominess, somberness, sombreness |
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| (noun) a state of partial or total darkness | Synonyms: somberness, sombreness |
| (noun) an atmosphere of depression and melancholy | Synonyms: gloominess, glumness |
| glowworm | (noun) the luminous larva or wingless grub-like female of a firefly | - |
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| glucinium | (noun) a light strong brittle grey toxic bivalent metallic element | Synonyms: atomic number 4, Be, beryllium |
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| glum | (adjective) moody and melancholic | - |
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| (adjective) showing a brooding ill humor | Synonyms: dark, dour, glowering, moody, morose, saturnine, sour, sullen |
| gm | (noun) a metric unit of weight equal to one thousandth of a kilogram | Synonyms: g, gram, gramme |
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| gnetum | (noun) small tropical tree with tiered branches and divaricate branchlets having broad glossy dark green leaves; exploited for its edible young leaves and seeds that provide a fine flour | Synonyms: Gnetum gnemon |
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| goddam | (adjective) expletives used informally as intensifiers | Synonyms: blame, blamed, blasted, blessed, damn, damned, darned, deuced, goddamn, goddamned, infernal |
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| (adverb) expressing anger, despair, frustration, approval, or surprise | Synonyms: goddamn, goddamned |
| golem | (noun) a mechanism that can move automatically | Synonyms: automaton, robot |
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| (noun) (Jewish folklore) an artificially created human being that is given life by supernatural means | - |
| gourmandism | (noun) the disposition and habits of a gourmand | - |
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| graham | (noun) flour made by grinding the entire wheat berry including the bran; (`whole meal flour' is British usage) | Synonyms: graham flour, whole meal flour, whole wheat flour |
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| gram | (noun) a metric unit of weight equal to one thousandth of a kilogram | Synonyms: g, gm, gramme |
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| graphospasm | (noun) muscular spasms of thumb and forefinger while writing with a pen or pencil | Synonyms: writer's cramp |
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| greenroom | (noun) a backstage room in a theater where performers rest or have visitors | - |
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| grillroom | (noun) a restaurant where food is cooked on a grill | Synonyms: grill |
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| grim | (adjective) shockingly repellent; inspiring horror | Synonyms: ghastly, grisly, gruesome, macabre, sick |
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| (adjective) filled with melancholy and despondency | Synonyms: blue, depressed, dispirited, down, down in the mouth, downcast, downhearted, gloomy, low-spirited, low |
| (adjective) causing dejection | Synonyms: blue, dark, dingy, disconsolate, dismal, drab, drear, dreary, gloomy, sorry |
| (adjective) not to be placated or appeased or moved by entreaty | Synonyms: inexorable, relentless, stern, unappeasable, unforgiving, unrelenting |
| (adjective) harshly ironic or sinister | Synonyms: black, mordant |
| (adjective) harshly uninviting or formidable in manner or appearance | Synonyms: dour, forbidding |
| grogram | (noun) a coarse fabric of silk mixed with wool or mohair and often stiffened with gum | - |
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| groom | (noun) a man who has recently been married | Synonyms: bridegroom |
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| (noun) someone employed in a stable to take care of the horses | Synonyms: hostler, ostler, stableboy, stableman |
| (noun) a man participant in his own marriage ceremony | Synonyms: bridegroom |
| (verb) care for one's external appearance | Synonyms: neaten |
| (verb) give a neat appearance to | Synonyms: curry, dress |
| (verb) educate for a future role or function | Synonyms: prepare, train |
| guaiacum | (noun) hard greenish-brown wood of the lignum vitae tree and other trees of the genus Guaiacum | Synonyms: guaiac, lignum vitae |
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| (noun) medicinal resin from the lignum vitae tree | - |
| guardroom | (noun) a room used by soldiers on guard | - |
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| (noun) a cell in which soldiers who are prisoners are confined | - |
| guestroom | (noun) a bedroom that is kept for the use of guests | - |
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| gum | (noun) the tissue (covered by mucous membrane) of the jaws that surrounds the bases of the teeth | Synonyms: gingiva |
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| (noun) a preparation (usually made of sweetened chicle) for chewing | Synonyms: chewing gum |
| (noun) any of various trees of the genera Eucalyptus or Liquidambar or Nyssa that are sources of gum | Synonyms: gum tree |
| (noun) wood or lumber from any of various gum trees especially the sweet gum | Synonyms: gumwood |
| (noun) any of various substances (soluble in water) that exude from certain plants; they are gelatinous when moist but harden on drying | - |
| (noun) cement consisting of a sticky substance that is used as an adhesive | Synonyms: glue, mucilage |
| (verb) exude or form gum | - |
| (verb) become sticky | - |
| (verb) grind with the gums; chew without teeth and with great difficulty | Synonyms: mumble |
| (verb) cover, fill, fix or smear with or as if with gum | - |
| gym | (noun) athletic facility equipped for sports or physical training | Synonyms: gymnasium |
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| gymnasium | (noun) athletic facility equipped for sports or physical training | Synonyms: gym |
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| gymnosperm | (noun) plants of the class Gymnospermae having seeds not enclosed in an ovary | - |
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| gynoecium | (noun) a female gametoecium | - |
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| gynostegium | (noun) the crown of the stamen in plants of the genus Asclepias | - |
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| gypsum | (noun) a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris) | - |
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| haem | (noun) a complex red organic pigment containing iron and other atoms to which oxygen binds | Synonyms: haemitin, hematin, heme, protoheme |
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