| fiance | (noun) a man who is engaged to be married | Synonyms: groom-to-be |
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| fiancee | (noun) a woman who is engaged to be married | Synonyms: bride-to-be |
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| fiasco | (noun) a sudden and violent collapse | Synonyms: debacle |
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| fiat | (noun) a legally binding command or decision entered on the court record (as if issued by a court or judge) | Synonyms: decree, edict, order, rescript |
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| fib | (noun) a trivial lie | Synonyms: story, tale, taradiddle, tarradiddle |
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| fibber | (noun) someone who tells lies | Synonyms: fabricator, storyteller |
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| fibbing | (noun) a trivial act of lying or being deliberately unclear | Synonyms: paltering |
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| fiber | (noun) a leatherlike material made by compressing layers of paper or cloth | Synonyms: fibre, vulcanized fiber |
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| (noun) the inherent complex of attributes that determines a persons moral and ethical actions and reactions | Synonyms: character, fibre |
| (noun) any of several elongated, threadlike cells (especially a muscle fiber or a nerve fiber) | Synonyms: fibre |
| (noun) coarse, indigestible plant food low in nutrients; its bulk stimulates intestinal peristalsis | Synonyms: fibre, roughage |
| (noun) a slender and greatly elongated substance capable of being spun into yarn | Synonyms: fibre |
| fiberboard | (noun) wallboard composed of wood chips or shavings bonded together with resin and compressed into rigid sheets | Synonyms: fibreboard, particle board |
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| fiberglass | (noun) a covering material made of glass fibers in resins | Synonyms: fibreglass |
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| fiberoptics | (noun) the transmission of light signals via glass fibers | Synonyms: fiber optics, fibre optics, fibreoptics |
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| fiberscope | (noun) a flexible medical instrument involving fiber optics that is used to examine internal organs | - |
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| fibre | (noun) a leatherlike material made by compressing layers of paper or cloth | Synonyms: fiber, vulcanized fiber |
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| (noun) the inherent complex of attributes that determines a persons moral and ethical actions and reactions | Synonyms: character, fiber |
| (noun) any of several elongated, threadlike cells (especially a muscle fiber or a nerve fiber) | Synonyms: fiber |
| (noun) coarse, indigestible plant food low in nutrients; its bulk stimulates intestinal peristalsis | Synonyms: fiber, roughage |
| (noun) a slender and greatly elongated substance capable of being spun into yarn | Synonyms: fiber |
| fibreboard | (noun) wallboard composed of wood chips or shavings bonded together with resin and compressed into rigid sheets | Synonyms: fiberboard, particle board |
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| fibreglass | (noun) a covering material made of glass fibers in resins | Synonyms: fiberglass |
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| fibreoptics | (noun) the transmission of light signals via glass fibers | Synonyms: fiber optics, fiberoptics, fibre optics |
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| fibril | (noun) a very slender natural or synthetic fiber | Synonyms: filament, strand |
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| fibrillation | (noun) act or process of forming fibrils | - |
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| (noun) muscular twitching involving individual muscle fibers acting without coordination | - |
| fibrin | (noun) a white insoluble fibrous protein formed by the action of thrombin on fibrinogen when blood clots; it forms a network that traps red cells and platelets | - |
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| fibrinase | (noun) in the clotting of blood thrombin catalyzes factor XIII into its active form (fibrinase) which causes fibrin to form a stable clot | Synonyms: factor XIII |
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| fibrinogen | (noun) a protein present in blood plasma; converts to fibrin when blood clots | Synonyms: factor I |
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| fibrinolysin | (noun) an enzyme that dissolves the fibrin of blood clots | Synonyms: plasmin |
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| fibrinolysis | (noun) a normal ongoing process that dissolves fibrin and results in the removal of small blood clots | - |
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| fibrinopeptide | (noun) peptide released from the amino end of fibrinogen by the action of thrombin to form fibrin during clotting of the blood | - |
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| fibroadenoma | (noun) benign and movable and firm and not tender tumor of the breast; common in young women and caused by high levels of estrogen | - |
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| fibroblast | (noun) a cell from which connective tissue develops | - |
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| fibrocartilage | (noun) cartilage that is largely composed of fibers like those in ordinary connective tissue | - |
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| fibroid | (noun) benign tumor containing fibrous tissue (especially in the uterus) | Synonyms: fibroid tumor |
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| fibroma | (noun) nonmalignant tumor of connective tissue | - |
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| fibromyositis | (noun) local inflammation of muscle and connective tissue | - |
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| fibrosis | (noun) development of excess fibrous connective tissue in an organ | - |
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| fibrositis | (noun) inflammation of white fibrous tissues (especially muscle sheaths) | - |
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| fibrosity | (noun) the quality of being fibrous | Synonyms: fibrousness |
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| fibrousness | (noun) the quality of being fibrous | Synonyms: fibrosity |
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| fibula | (noun) the outer and thinner of the two bones of the human leg between the knee and ankle | Synonyms: calf bone |
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| fice | (noun) a nervous belligerent little mongrel dog | Synonyms: feist |
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| fichu | (noun) a lightweight triangular scarf worn by a woman | - |
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| fickleness | (noun) unfaithfulness by virtue of being unreliable or treacherous | Synonyms: faithlessness, falseness, inconstancy |
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| fiction | (noun) a literary work based on the imagination and not necessarily on fact | - |
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| (noun) a deliberately false or improbable account | Synonyms: fable, fabrication |
| fictionalisation | (noun) writing in a fictional form | Synonyms: fabrication, fictionalization |
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| (noun) a literary work based partly or wholly on fact but written as if it were fiction | Synonyms: fictionalization |
| fictionalization | (noun) writing in a fictional form | Synonyms: fabrication, fictionalisation |
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| (noun) a literary work based partly or wholly on fact but written as if it were fiction | Synonyms: fictionalisation |
| fiddle | (noun) bowed stringed instrument that is the highest member of the violin family; this instrument has four strings and a hollow body and an unfretted fingerboard and is played with a bow | Synonyms: violin |
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| fiddlehead | (noun) New World fern having woolly cinnamon-colored spore-bearing fronds in early spring later surrounded by green fronds; the early uncurling fronds are edible | Synonyms: cinnamon fern, fiddlehead fern, Osmunda cinnamonea |
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| (noun) tall fern of northern temperate regions having graceful arched fronds and sporophylls resembling ostrich plumes | Synonyms: Matteuccia struthiopteris, Onoclea struthiopteris, ostrich fern, Pteretis struthiopteris, shuttlecock fern |
| fiddleneck | (noun) hairy annual of California to Mexico with crowded cymes of small blue to lilac or mauve flowers | Synonyms: Phacelia tanacetifolia |
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| fiddler | (noun) a musician who plays the violin | Synonyms: violinist |
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| (noun) an unskilled person who tries to fix or mend | Synonyms: tinkerer |
| (noun) someone who manipulates in a nervous or unconscious manner | Synonyms: twiddler |
| fiddlestick | (noun) a bow used in playing the violin | Synonyms: violin bow |
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| fidelity | (noun) the quality of being faithful | Synonyms: faithfulness |
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| (noun) accuracy with which an electronic system reproduces the sound or image of its input signal | - |
| fidget | (noun) a feeling of agitation expressed in continual motion | Synonyms: fidgetiness, restlessness |
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| fidgetiness | (noun) a feeling of agitation expressed in continual motion | Synonyms: fidget, restlessness |
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| fiduciary | (noun) a person who holds assets in trust for a beneficiary | - |
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| fief | (noun) a piece of land held under the feudal system | Synonyms: feoff |
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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 | - |
| field | (noun) a particular kind of commercial enterprise | Synonyms: field of operation, line of business |
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| (noun) a place where planes take off and land | Synonyms: airfield, flying field, landing field |
| (noun) a branch of knowledge | Synonyms: bailiwick, discipline, field of study, study, subject, subject area, subject field |
| (noun) the area that is visible (as through an optical instrument) | Synonyms: field of view |
| (noun) (mathematics) a set of elements such that addition and multiplication are commutative and associative and multiplication is distributive over addition and there are two elements 0 and 1 | - |
| (noun) all of the horses in a particular horse race | - |
| (noun) all the competitors in a particular contest or sporting event | - |
| (noun) (computer science) a set of one or more adjacent characters comprising a unit of information | - |
| (noun) a piece of land cleared of trees and usually enclosed | - |
| (noun) somewhere (away from a studio or office or library or laboratory) where practical work is done or data is collected | - |
| (noun) a piece of land prepared for playing a game | Synonyms: athletic field, playing area, playing field |
| (noun) a region in which active military operations are in progress | Synonyms: field of operations, theater, theater of operations, theatre, theatre of operations |
| (noun) a region where a battle is being (or has been) fought | Synonyms: battlefield, battleground, field of battle, field of honor |
| (noun) a geographic region (land or sea) under which something valuable is found | - |
| (noun) extensive tract of level open land | Synonyms: champaign, plain |
| (noun) the space around a radiating body within which its electromagnetic oscillations can exert force on another similar body not in contact with it | Synonyms: field of force, force field |
| (noun) a particular environment or walk of life | Synonyms: area, arena, domain, orbit, sphere |
| fielder | (noun) a member of the baseball team that is in the field instead of at bat | - |
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| (noun) a member of the cricket team that is fielding rather than batting | Synonyms: fieldsman |
| fieldfare | (noun) medium-sized Eurasian thrush seen chiefly in winter | Synonyms: snowbird, Turdus pilaris |
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| fieldhand | (noun) a hired hand on a farm | Synonyms: farm worker, farmhand, field hand |
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| fielding | (noun) (baseball) handling the ball while playing in the field | - |
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| fieldmouse | (noun) any nocturnal Old World mouse of the genus Apodemus inhabiting woods and fields and gardens | Synonyms: field mouse |
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| fieldsman | (noun) a member of the cricket team that is fielding rather than batting | Synonyms: fielder |
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| fieldstone | (noun) stone that occurs naturally in fields; often used as building material | - |
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| fieldwork | (noun) a temporary fortification built by troops in the field | - |
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| fieldworker | (noun) a researcher who works in the field | - |
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| fiend | (noun) a cruel wicked and inhuman person | Synonyms: demon, devil, monster, ogre |
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| (noun) a person motivated by irrational enthusiasm (as for a cause) | Synonyms: fanatic |
| (noun) an evil supernatural being | Synonyms: daemon, daimon, demon, devil |
| fierceness | (noun) the property of being wild or turbulent | Synonyms: ferocity, furiousness, fury, vehemence, violence, wildness |
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| fieriness | (noun) the heat or the color of fire | Synonyms: red heat |
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| (noun) a passionate and quick-tempered nature | - |
| fiesta | (noun) an elaborate party (often outdoors) | Synonyms: feast, fete |
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| fife | (noun) a small high-pitched flute similar to a piccolo; has a shrill tone and is used chiefly to accompany drums in a marching band | - |
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| fifteen | (noun) the cardinal number that is the sum of fourteen and one | Synonyms: 15, XV |
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| fifteenth | (noun) position 15 in a countable series of things | - |
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| fifth | (noun) the musical interval between one note and another five notes away from it | - |
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| (noun) one part in five equal parts | Synonyms: fifth part, one-fifth, twenty percent |
| (noun) a quantity of liquor equal to one fifth of a United States gallon | - |
| (noun) position five in a countable series of things | - |
| fifties | (noun) the time of life between 50 and 60 | Synonyms: mid-fifties |
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| (noun) the decade from 1950 to 1959 | Synonyms: 1950s |
| fiftieth | (noun) position 50 in a countable series of things | - |
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| fifty | (noun) a United States bill worth 50 dollars | Synonyms: fifty dollar bill |
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| (noun) the cardinal number that is the product of ten and five | Synonyms: 50, L |
| fig | (noun) a diagram or picture illustrating textual material | Synonyms: figure |
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| (noun) fleshy sweet pear-shaped yellowish or purple multiple fruit eaten fresh or preserved or dried | - |
| (noun) Mediterranean tree widely cultivated for its edible fruit | Synonyms: common fig, common fig tree, Ficus carica |
| figeater | (noun) large greenish June beetle of southern United States | Synonyms: green June beetle |
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| fight | (noun) a hostile meeting of opposing military forces in the course of a war | Synonyms: battle, conflict, engagement |
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| (noun) the act of fighting; any contest or struggle | Synonyms: combat, fighting, scrap |
| (noun) a boxing or wrestling match | - |
| (noun) an aggressive willingness to compete | Synonyms: competitiveness |
| (noun) an intense verbal dispute | - |
| fighter | (noun) a high-speed military or naval airplane designed to destroy enemy aircraft in the air | Synonyms: attack aircraft, fighter aircraft |
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| (noun) someone who fights (or is fighting) | Synonyms: battler, belligerent, combatant, scrapper |
| (noun) someone who fights for a cause | Synonyms: champion, hero, paladin |
| fighting | (noun) the act of fighting; any contest or struggle | Synonyms: combat, fight, scrap |
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| figment | (noun) a contrived or fantastic idea | - |
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| figuration | (noun) decorating with a design | - |
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| (noun) representing figuratively as by emblem or allegory | - |
| figurativeness | (noun) The property of being metaphorical or tropical, as opposed to literal; using figures of speech. | - |
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| (noun) The representation of form or figure in art. | - |
| figure | (noun) a predetermined set of movements in dancing or skating | - |
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| (noun) a model of a bodily form (especially of a person) | - |
| (noun) a decorative or artistic work | Synonyms: design, pattern |
| (noun) the impression produced by a person | - |
| (noun) the property possessed by a sum or total or indefinite quantity of units or individuals | Synonyms: number |
| (noun) alternative names for the body of a human being | Synonyms: anatomy, bod, build, chassis, flesh, form, frame, human body, material body, physical body, physique, shape, soma |
| (noun) a unitary percept having structure and coherence that is the object of attention and that stands out against a ground | - |
| (noun) a diagram or picture illustrating textual material | Synonyms: fig |
| (noun) language used in a figurative or nonliteral sense | Synonyms: figure of speech, image, trope |
| (noun) a well-known or notable person | Synonyms: name, public figure |
| (noun) an amount of money expressed numerically | - |
| (noun) one of the elements that collectively form a system of numeration | Synonyms: digit |
| (noun) a combination of points and lines and planes that form a visible palpable shape | - |
| figurehead | (noun) figure on the bow of some sailing vessels | - |
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| (noun) a person used as a cover for some questionable activity | Synonyms: front, front man, nominal head, straw man, strawman |
| figurer | (noun) an expert at calculation (or at operating calculating machines) | Synonyms: calculator, computer, estimator, reckoner |
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| figurine | (noun) a small carved or molded figure | Synonyms: statuette |
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| figuring | (noun) problem solving that involves numbers or quantities | Synonyms: calculation, computation, reckoning |
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| figwort | (noun) any of numerous tall coarse woodland plants of the genus Scrophularia | - |
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| filaggrin | (noun) the main protein of the keratohyalin granules | - |
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| filago | (noun) any plant of the genus Filago having capitate clusters of small woolly flower heads | Synonyms: cotton rose, cudweed |
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| filagree | (noun) delicate and intricate ornamentation (usually in gold or silver or other fine twisted wire) | Synonyms: filigree, fillagree |
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| filament | (noun) a thin wire (usually tungsten) that is heated white hot by the passage of an electric current | - |
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| (noun) a threadlike structure (as a chainlike series of cells) | Synonyms: filum |
| (noun) the stalk of a stamen | - |
| (noun) a very slender natural or synthetic fiber | Synonyms: fibril, strand |
| filaree | (noun) European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage | Synonyms: alfilaria, alfileria, clocks, Erodium cicutarium, filaria, pin clover, pin grass, redstem storksbill |
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| filaria | (noun) slender threadlike roundworms living in the blood and tissues of vertebrates; transmitted as larvae by biting insects | - |
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| (noun) European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage | Synonyms: alfilaria, alfileria, clocks, Erodium cicutarium, filaree, pin clover, pin grass, redstem storksbill |
| filariasis | (noun) a disease caused by nematodes in the blood or tissues of the body causing blockage of lymphatic vessels | - |
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| filature | (noun) a bobbin used in spinning silk into thread | - |
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| filbert | (noun) nut of any of several trees of the genus Corylus | Synonyms: cob, cobnut, hazelnut |
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| (noun) small nut-bearing tree much grown in Europe | Synonyms: cobnut, Corylus avellana, Corylus avellana grandis |
| file | (noun) a steel hand tool with small sharp teeth on some or all of its surfaces; used for smoothing wood or metal | - |
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| (noun) office furniture consisting of a container for keeping papers in order | Synonyms: file cabinet, filing cabinet |
| (noun) a set of related records (either written or electronic) kept together | Synonyms: data file |
| (noun) a line of persons or things ranged one behind the other | Synonyms: Indian file, single file |
| filefish | (noun) narrow flattened warm-water fishes with leathery skin and a long file-like dorsal spine | - |
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| filename | (noun) (computer science) the name given to a computer file in order to distinguish it from other files; may contain an extension that indicates the type of file | Synonyms: computer file name, computer filename, file name |
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| filer | (noun) a party who files a notice with a law court | - |
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| (noun) a clerk who is employed to maintain the files of an organization | Synonyms: file clerk, filing clerk |