| 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 |
| filamentlike | (adjective) thin in diameter; resembling a thread | Synonyms: filamentous, filiform, threadlike, thready |
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| filamentous | (adjective) thin in diameter; resembling a thread | Synonyms: filamentlike, filiform, threadlike, thready |
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| filar | (adjective) related to or having filaments (especially across a field of view as in the eyepiece of a telescope) | - |
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| 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 |
| filarial | (adjective) related to or infested with or transmitting parasitic worms especially filaria | - |
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| filariasis | (noun) a disease caused by nematodes in the blood or tissues of the body causing blockage of lymphatic vessels | - |
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| filariid | (adjective) of or relating to or belonging to the family Filariidae | - |
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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 |
| filch | (verb) make off with belongings of others | Synonyms: abstract, cabbage, hook, lift, nobble, pilfer, pinch, purloin, snarf, sneak, swipe |
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| 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 |
| (verb) place in a container for keeping records | Synonyms: file away |
| (verb) file a formal charge against | Synonyms: charge, lodge |
| (verb) record in a public office or in a court of law | Synonyms: register |
| (verb) smooth with a file | - |
| (verb) proceed in line | - |
| 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 |
| filet | (noun) lace having a square mesh | Synonyms: fillet |
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| (noun) a boneless steak cut from the tenderloin of beef | Synonyms: fillet |
| (noun) a longitudinal slice or boned side of a fish | Synonyms: fillet, fish filet, fish fillet |
| (verb) cut into filets | Synonyms: fillet |
| (verb) decorate with a lace of geometric designs | Synonyms: fillet |
| filial | (adjective) relating to or characteristic of or befitting an offspring | - |
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| (adjective) designating the generation or the sequence of generations following the parental generation | - |
| filiate | (verb) fix the paternity of | - |
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| filiation | (noun) inherited properties shared with others of your bloodline | Synonyms: ancestry, derivation, lineage |
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| (noun) the kinship relation between an individual and the individual's progenitors | Synonyms: descent, line of descent, lineage |
| filibuster | (noun) (law) a tactic for delaying or obstructing legislation by making long speeches | - |
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| (noun) a legislator who gives long speeches in an effort to delay or obstruct legislation that he (or she) opposes | Synonyms: filibusterer |
| (verb) obstruct deliberately by delaying | - |
| filibusterer | (noun) a legislator who gives long speeches in an effort to delay or obstruct legislation that he (or she) opposes | Synonyms: filibuster |
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| filicide | (noun) the murder of your own son or daughter | - |
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| (noun) a parent who murders his own son or daughter | - |
| filiform | (adjective) thin in diameter; resembling a thread | Synonyms: filamentlike, filamentous, threadlike, thready |
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| filigree | (noun) delicate and intricate ornamentation (usually in gold or silver or other fine twisted wire) | Synonyms: filagree, fillagree |
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| (verb) make filigree, as with a precious metal | - |
| filing | (noun) preservation and methodical arrangement as of documents and papers etc. | - |
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| (noun) the act of using a file (as in shaping or smoothing an object) | - |
| (noun) the entering of a legal document into the public record | - |
| (noun) a fragment rubbed off by the use of a file | - |
| fill | (noun) a quantity sufficient to satisfy | - |
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| (noun) any material that fills a space or container | Synonyms: filling |
| (verb) become full | Synonyms: fill up |
| (verb) make full, also in a metaphorical sense | Synonyms: fill up, make full |
| (verb) plug with a substance | - |
| (verb) fill to satisfaction | Synonyms: replete, sate, satiate |
| (verb) eat until one is sated | Synonyms: fill up |
| (verb) fill, satisfy or meet a want or need or condition or restriction | Synonyms: conform to, fit, fulfil, fulfill, meet, satisfy |
| (verb) assume, as of positions or roles | Synonyms: occupy, take |
| (verb) appoint someone to (a position or a job) | - |
| (verb) occupy the whole of | Synonyms: occupy |
| fillagree | (noun) delicate and intricate ornamentation (usually in gold or silver or other fine twisted wire) | Synonyms: filagree, filigree |
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| fille | (noun) a young female | Synonyms: girl, miss, missy, young lady, young woman |
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| filled | (adjective) of purchase orders that have been filled | - |
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| (adjective) (of time) taken up | - |
| (adjective) (usually followed by `with' or used as a combining form) generously supplied with | - |
| filler | (noun) the tobacco used to form the core of a cigar | - |
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| (noun) anything added to fill out a whole | Synonyms: makeweight |
| (noun) copy to fill space between more important articles in the layout of a magazine or newspaper | - |
| (noun) 100 filler equal 1 forint in Hungary | - |
| (noun) used for filling cracks or holes in a surface | - |
| fillet | (noun) a narrow headband or strip of ribbon worn as a headband | Synonyms: taenia, tenia |
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| (noun) fastener consisting of a narrow strip of welded metal used to join steel members | Synonyms: stopping |
| (noun) lace having a square mesh | Synonyms: filet |
| (noun) a bundle of sensory nerve fibers going to the thalamus | Synonyms: lemniscus |
| (noun) a boneless steak cut from the tenderloin of beef | Synonyms: filet |
| (noun) a longitudinal slice or boned side of a fish | Synonyms: filet, fish filet, fish fillet |
| (verb) cut into filets | Synonyms: filet |
| (verb) decorate with a lace of geometric designs | Synonyms: filet |
| filling | (noun) the act of filling something | - |
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| (noun) the yarn woven across the warp yarn in weaving | Synonyms: pick, weft, woof |
| (noun) (dentistry) a dental appliance consisting of any of various substances (as metal or plastic) inserted into a prepared cavity in a tooth | - |
| (noun) a food mixture used to fill pastry or sandwiches etc. | - |
| (noun) flow into something (as a container) | - |
| (noun) any material that fills a space or container | Synonyms: fill |
| fillip | (noun) anything that tends to arouse | Synonyms: bonus |
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| filly | (noun) a young female horse under the age of four | - |
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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 | - |
| filmable | (adjective) (used of a story or literary work) capable of being adapted to motion picture form | - |
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| filmdom | (noun) the personnel of the film industry | Synonyms: screen, screenland |
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| filmed | (adjective) recorded on film; made into a movie | - |
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| filming | (noun) the act of making a film | Synonyms: cinematography, motion-picture photography |
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| filmmaker | (noun) a producer of motion pictures | Synonyms: film maker, film producer, movie maker |
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| filmy | (adjective) so thin as to transmit light | Synonyms: cobwebby, diaphanous, gauze-like, gauzy, gossamer, see-through, sheer, transparent, vaporous, vapourous |
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| filoselle | (noun) a soft silk embroidery thread. | - |
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| filovirus | (noun) animal viruses belonging to the family Filoviridae | - |
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| fils | (noun) a fractional monetary unit in Bahrain and Iraq and Jordan and Kuwait; equal to one thousandth of a dinar | - |
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| (noun) 100 Yemeni fils are worth one Yemeni rial | Synonyms: Yemeni fils |
| filter | (noun) device that removes something from whatever passes through it | - |
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| (noun) an electrical device that alters the frequency spectrum of signals passing through it | - |
| (verb) remove by passing through a filter | Synonyms: filter out, filtrate, separate out, strain |
| (verb) pass through | Synonyms: percolate, permeate, sink in |
| (verb) run or flow slowly, as in drops or in an unsteady stream | Synonyms: dribble, trickle |
| filth | (noun) an offensive or indecent word or phrase | Synonyms: dirty word, obscenity, smut, vulgarism |
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| (noun) a state characterized by foul or disgusting dirt and refuse | Synonyms: filthiness, foulness, nastiness |
| (noun) anything regarded as making something unclean | Synonyms: dirt, grease, grime, grunge, soil, stain |
| (noun) any substance considered disgustingly foul or unpleasant | Synonyms: crud, skank |
| filthily | (adverb) in a filthy unclean manner | Synonyms: dirtily |
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| filthiness | (noun) moral corruption or pollution | - |
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| (noun) a state characterized by foul or disgusting dirt and refuse | Synonyms: filth, foulness, nastiness |
| filthy | (adjective) disgustingly dirty; filled or smeared with offensive matter | Synonyms: foul, nasty |
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| (adjective) characterized by obscenity | Synonyms: cruddy, foul, nasty, smutty |
| (adjective) vile; despicable | Synonyms: dirty, lousy |
| filtrate | (noun) the product of filtration; a gas or liquid that has been passed through a filter | - |
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| (verb) remove by passing through a filter | Synonyms: filter, filter out, separate out, strain |
| filtration | (noun) the act of changing a fluid by passing it through a filter | - |
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| (noun) the process whereby fluids pass through a filter or a filtering medium | - |
| filum | (noun) a threadlike structure (as a chainlike series of cells) | Synonyms: filament |
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