| 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 |
| 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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| 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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| 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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| 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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| 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 |
| 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 |
| 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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| hafnium | (noun) a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons | Synonyms: atomic number 72, Hf |
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| hagionym | (noun) The name of a Saint taken as a proper name. | - |
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| hahnium | (noun) a transuranic element with atomic number 105 | Synonyms: atomic number 105, Db, dubnium, element 105 |
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| hailstorm | (noun) a storm during which hail falls | - |
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| hakeem | (noun) a Muslim physician | Synonyms: hakim |
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| hakim | (noun) a Muslim physician | Synonyms: hakeem |
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| (noun) a Muslim ruler or governor or judge | - |
| halm | (noun) stems of beans and peas and potatoes and grasses collectively as used for thatching and bedding | Synonyms: haulm |
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| halobacterium | (noun) halophiles in saline environments such as the Dead Sea or salt flats | Synonyms: halobacter, halobacteria |
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| haloform | (noun) compounds with the formula CHX3, where X is a halogen atom | - |
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| ham | (noun) meat cut from the thigh of a hog (usually smoked) | Synonyms: gammon, jambon |
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| (noun) an unskilled actor who overacts | Synonyms: ham actor |
| (noun) a licensed amateur radio operator | - |
| handloom | (noun) a loom powered by hand | - |
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| hansom | (noun) a two-wheeled horse-drawn covered carriage with the driver's seat above and behind the passengers | Synonyms: hansom cab |
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| hareem | (noun) living quarters reserved for wives and concubines and female relatives in a Muslim household | Synonyms: harem, seraglio, serail |
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| harem | (noun) living quarters reserved for wives and concubines and female relatives in a Muslim household | Synonyms: hareem, seraglio, serail |
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| harm | (noun) the act of damaging something or someone | Synonyms: damage, hurt, scathe |
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| (noun) the occurrence of a change for the worse | Synonyms: damage, impairment |
| (noun) any physical damage to the body caused by violence or accident or fracture etc.; the condition of an injury | Synonyms: hurt, injury, trauma |
| harmonium | (noun) a free-reeded instrument with a piano keyboard in which air is forced through the reeds by bellows | Synonyms: organ, reed organ |
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| hassium | (noun) a radioactive transuranic element, with atomic number 108 | Synonyms: atomic number 108, element 108, Hs |
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| haulm | (noun) stems of beans and peas and potatoes and grasses collectively as used for thatching and bedding | Synonyms: halm |
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| haustorium | (noun) a root-like attachment in parasitic plants that penetrates and obtains food from the host | - |
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| headroom | (noun) the capacity of a system to reproduce loud sounds without distortion | Synonyms: dynamic headroom |
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| (noun) vertical space available to allow easy passage under something | Synonyms: clearance, headway |
| headstream | (noun) a stream that forms the source of a river | - |
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| heathenism | (noun) any of various religions other than Christianity or Judaism or Islamism | Synonyms: pagan religion, paganism |
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| hectogram | (noun) 100 grams | Synonyms: hg |
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| hedonism | (noun) an ethical system that evaluates the pursuit of pleasure as the highest good | - |
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| (noun) the pursuit of pleasure as a matter of ethical principle | - |
| heirloom | (noun) something that has been in a family for generations | - |
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| (noun) (law) any property that is considered by law or custom as inseparable from an inheritance is inherited with that inheritance | - |
| helianthemum | (noun) any plant of the genus Helianthemum; vigorous plants of stony alpine meadows and dry scrub regions | Synonyms: sun rose, sunrose |
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| heliogram | (noun) a message transmitted by means of the sun's rays | - |
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| heliotropism | (noun) an orienting response to the sun | - |
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| helium | (noun) a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas) | Synonyms: atomic number 2, He |
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| helm | (noun) (figurative) a position of leadership | - |
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| (noun) steering mechanism for a vessel; a mechanical device by which a vessel is steered | - |
| hem | (noun) the edge of a piece of cloth; especially the finished edge that has been doubled under and stitched down | - |
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| (noun) the utterance of a sound similar to clearing the throat; intended to get attention, express hesitancy, fill a pause, hide embarrassment, warn a friend, etc. | Synonyms: ahem |
| hemidrachm | (noun) an ancient Greek silver coin equal to 1/2 drachm or 3 obols in value. | - |
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| hemimetabolism | (noun) incomplete or partial metamorphosis in insects | Synonyms: hemimetaboly, hemimetamorphosis |
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| herbarium | (noun) a collection of dried plants that are mounted and systematically classified for study | - |
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| hereditarianism | (noun) the philosophical doctrine that heredity is more important than environment in determining intellectual growth | - |
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| herm | (noun) a statue consisting of a squared stone pillar with a carved head (usually a bearded Hermes) on top; used in ancient Greece as a boundary marker or signpost | - |
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| hermaphrodism | (noun) congenital condition in which external genitalia and internal sex organs have both male and female characteristics | Synonyms: hermaphroditism |
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| hermaphroditism | (noun) showing characteristics of both sexes | Synonyms: androgyny, bisexuality |
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| (noun) congenital condition in which external genitalia and internal sex organs have both male and female characteristics | Synonyms: hermaphrodism |
| heroism | (noun) the qualities of a hero or heroine; exceptional or heroic courage when facing danger (especially in battle) | Synonyms: gallantry, valiance, valiancy, valor, valorousness, valour |
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| heterometabolism | (noun) development of insects with incomplete metamorphosis in which no pupal stage precedes maturity | Synonyms: heterometaboly |
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| heteronym | (noun) two words are heteronyms if they are spelled the same way but differ in pronunciation | - |
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| heterosexism | (noun) discrimination in favor of heterosexual and against homosexual people | - |
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| heterosexualism | (noun) a sexual attraction to (or sexual relations with) persons of the opposite sex | Synonyms: heterosexuality, straightness |
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| hexagram | (noun) a regular polygon formed by extending each of the sides of a regular hexagon to form two equilateral triangles | - |
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| hilum | (noun) (anatomy) a depression or fissure where vessels or nerves or ducts enter a bodily organ | Synonyms: hilus |
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| (noun) the scar on certain seeds marking its point of attachment to the funicle | - |
| hippeastrum | (noun) amaryllis of tropical America often cultivated as a houseplant for its showy white to red flowers | Synonyms: Hippeastrum puniceum |
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| hirsutism | (noun) excessive hairiness | Synonyms: hirsuteness |
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| histogram | (noun) a bar chart representing a frequency distribution; heights of the bars represent observed frequencies | - |
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| historicism | (noun) a theory that social and cultural events are determined by history | - |
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| hm | (noun) a metric unit of length equal to 100 meters | Synonyms: hectometer, hectometre |
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| hobbyism | (noun) a devotion to hobbies | - |
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| hokum | (noun) a message that seems to convey no meaning | Synonyms: bunk, meaninglessness, nonsense, nonsensicality |
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| holism | (noun) the theory that the parts of any whole cannot exist and cannot be understood except in their relation to the whole | Synonyms: holistic theory |
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| holmium | (noun) a trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds | Synonyms: atomic number 67, Ho |
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| hologram | (noun) the intermediate photograph (or photographic record) that contains information for reproducing a three-dimensional image by holography | Synonyms: holograph |
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| holometabolism | (noun) complete metamorphosis in insects | Synonyms: holometaboly |
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| holonym | (noun) a word that names the whole of which a given word is a part | Synonyms: whole name |
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| homeotherm | (noun) an animal that has a body temperature that is relatively constant and independent of the environmental temperature | Synonyms: homoiotherm, homotherm |
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| homeroom | (noun) a classroom in which all students in a particular grade (or in a division of a grade) meet at certain times under the supervision of a teacher who takes attendance and does other administrative business | Synonyms: home room |
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| homoeroticism | (noun) a sexual attraction to (or sexual relations with) persons of the same sex | Synonyms: gayness, homosexualism, homosexuality, queerness |
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