| etiology | (noun) the philosophical study of causation | Synonyms: aetiology |
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| (noun) the cause of a disease | Synonyms: aetiology |
| etymologist | (noun) a lexicographer who specializes in etymology | - |
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| etymologizing | (noun) (historical linguistics) an explanation of the historical origins of a word or phrase | Synonyms: derivation, deriving |
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| etymology | (noun) the study of the sources and development of words | - |
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| (noun) a history of a word | - |
| eulogist | (noun) an orator who delivers eulogies or panegyrics | Synonyms: panegyrist |
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| eulogium | (noun) a formal expression of praise for someone who has died recently | Synonyms: eulogy |
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| eulogy | (noun) a formal expression of praise for someone who has died recently | Synonyms: eulogium |
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| (noun) a formal expression of praise | Synonyms: encomium, paean, panegyric, pean |
| exaflop | (noun) (computer science) a unit for measuring the speed of a computer system, equal to one quintillion floating-point operations a second. | Synonyms: EFLOPS |
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| exobiology | (noun) the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life | Synonyms: astrobiology, space biology |
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| exomphalos | (noun) an umbilical hernia at birth in which some abdominal organs push into the umbilical cord | - |
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| exploit | (noun) a notable achievement | Synonyms: effort, feat |
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| exploitation | (noun) the act of making some area of land or water more profitable or productive or useful | Synonyms: development |
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| (noun) an act that exploits or victimizes someone (treats them unfairly) | Synonyms: using, victimisation, victimization |
| exploiter | (noun) a person who uses something or someone selfishly or unethically | Synonyms: user |
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| exploration | (noun) a careful systematic search | - |
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| (noun) to travel for the purpose of discovery | Synonyms: geographic expedition |
| (noun) a systematic consideration | - |
| explorer | (noun) someone who travels into little known regions (especially for some scientific purpose) | Synonyms: adventurer |
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| explosion | (noun) the act of exploding or bursting | Synonyms: burst |
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| (noun) a golf shot from a bunker that typically moves sand as well as the golf ball | - |
| (noun) the terminal forced release of pressure built up during the occlusive phase of a stop consonant | Synonyms: plosion |
| (noun) a sudden outburst | - |
| (noun) a violent release of energy caused by a chemical or nuclear reaction | Synonyms: blowup, detonation |
| (noun) a sudden great increase | - |
| (noun) the noise caused by an explosion | - |
| explosive | (noun) a chemical substance that undergoes a rapid chemical change (with the production of gas) on being heated or struck | - |
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| falloff | (noun) a noticeable deterioration in performance or quality | Synonyms: drop-off, falling off, slack, slump |
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| fallout | (noun) any adverse and unwanted secondary effect | Synonyms: side effect |
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| (noun) the radioactive particles that settle to the ground after a nuclear explosion | Synonyms: radioactive dust |
| fallow | (noun) cultivated land that is not seeded for one or more growing seasons | - |
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| fanaloka | (noun) civet of Madagascar | Synonyms: Fossa fossa |
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| fasciolopsiasis | (noun) infestation with the large intestinal fluke Fasciolopsis buski; common in eastern Asia | - |
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| fasciolosis | (noun) infestation with the liver fluke Fasciola hepatica; liver damage sometimes occurs; related to liver rot | Synonyms: fascioliasis |
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| feedlot | (noun) a building where livestock are fattened for market | - |
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| felloe | (noun) rim (or part of the rim) into which spokes are inserted | Synonyms: felly |
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| fellow | (noun) a boy or man | Synonyms: blighter, bloke, chap, cuss, fella, feller, gent, lad |
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| (noun) a man who is the lover of a man or woman | Synonyms: beau, boyfriend, swain |
| (noun) a friend who is frequently in the company of another | Synonyms: associate, companion, comrade, familiar |
| (noun) a person who is member of one's class or profession | Synonyms: colleague, confrere |
| (noun) an informal form of address for a man | Synonyms: buster, dude |
| (noun) a member of a learned society | - |
| (noun) one of a pair | Synonyms: mate |
| fellowship | (noun) an association of people who share common beliefs or activities | Synonyms: family |
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| (noun) money granted (by a university or foundation or other agency) for advanced study or research | - |
| (noun) the state of being with someone | Synonyms: companionship, company, society |
| felon | (noun) someone who has committed a crime or has been legally convicted of a crime | Synonyms: criminal, crook, malefactor, outlaw |
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| (noun) a purulent infection at the end of a finger or toe in the area surrounding the nail | Synonyms: whitlow |
| feloniousness | (noun) The property of relating to, or having the nature of a serious criminal offense. | - |
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| felony | (noun) a serious crime (such as murder or arson) | - |
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| fermentologist | (noun) a specialist in wine making | Synonyms: enologist, oenologist |
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| fetlock | (noun) projection behind and above a horse's hoof | - |
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| (noun) the joint between the cannon bone and the pastern | Synonyms: fetlock joint |
| fetology | (noun) the branch of medicine concerned with the fetus in the uterus | Synonyms: foetology |
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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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| fingerflower | (noun) tall leafy European biennial or perennial having spectacular clusters of large tubular pink-purple flowers; leaves yield drug digitalis and are poisonous to livestock | Synonyms: common foxglove, Digitalis purpurea, fairy bell, finger-flower, finger-root, fingerroot |
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| firelock | (noun) a muzzle loader that had a flintlock type of gunlock | Synonyms: flintlock |
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| flameflower | (noun) plant with fleshy roots and erect stems with narrow succulent leaves and one reddish-orange flower in each upper leaf axil; southwestern United States; Indians once cooked the fleshy roots | Synonyms: flame-flower, flame flower, Talinum aurantiacum |
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| (noun) a plant of the genus Kniphofia having long grasslike leaves and tall scapes of red or yellow drooping flowers | Synonyms: flame-flower, flame flower, kniphofia, tritoma |
| flashflood | (noun) a sudden local flood of great volume and short duration | Synonyms: flash flood |
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| flintlock | (noun) an obsolete gunlock that has flint embedded in the hammer; the flint makes a spark that ignites the charge | - |
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| (noun) a muzzle loader that had a flintlock type of gunlock | Synonyms: firelock |
| float | (noun) an air-filled sac near the spinal column in many fishes that helps maintain buoyancy | Synonyms: air bladder, swim bladder |
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| (noun) something that floats on the surface of water | - |
| (noun) a hand tool with a flat face used for smoothing and finishing the surface of plaster or cement or stucco | Synonyms: plasterer's float |
| (noun) an elaborate display mounted on a platform carried by a truck (or pulled by a truck) in a procession or parade | - |
| (noun) a drink with ice cream floating in it | Synonyms: ice-cream float, ice-cream soda |
| (noun) the number of shares outstanding and available for trading by the public | - |
| (noun) the time interval between the deposit of a check in a bank and its payment | - |
| floatation | (noun) financing a commercial enterprise by bond or stock shares | Synonyms: flotation |
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| (noun) the phenomenon of floating (remaining on the surface of a liquid without sinking) | Synonyms: flotation |
| floater | (noun) an insurance policy covering loss of movable property (e.g. jewelry) regardless of its location | Synonyms: floating policy |
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| (noun) an object that floats or is capable of floating | - |
| (noun) a swimmer who floats in the water | - |
| (noun) a wanderer who has no established residence or visible means of support | Synonyms: clochard, drifter, vagabond, vagrant |
| (noun) a voter who votes illegally at different polling places in the same election | - |
| (noun) an employee who is reassigned from job to job as needed | - |
| (noun) a debt instrument with a variable interest rate tied to some other interest rate (e.g. the rate paid by T-bills) | - |
| (noun) spots before the eyes caused by opaque cell fragments in the vitreous humor and lens | Synonyms: musca volitans, muscae volitantes, spots |
| floating | (noun) the act of someone who floats on the water | Synonyms: natation |
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| floatplane | (noun) a seaplane equipped with pontoons for landing or taking off from water | Synonyms: pontoon plane |
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| floc | (noun) a small loosely aggregated mass of flocculent material suspended in or precipitated from a liquid | Synonyms: floccule |
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| flocculation | (noun) the process of flocculating; forming woolly cloudlike aggregations | - |
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| flocculator | (noun) An apparatus used in the process of flocculation. | - |
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| floccule | (noun) a small loosely aggregated mass of flocculent material suspended in or precipitated from a liquid | Synonyms: floc |
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| flock | (noun) a group of birds | - |
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| (noun) a group of sheep or goats | Synonyms: fold |
| (noun) a church congregation guided by a pastor | - |
| (noun) an orderly crowd | Synonyms: troop |
| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad |
| floe | (noun) a flat mass of ice (smaller than an ice field) floating at sea | Synonyms: ice floe |
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| flogger | (noun) a torturer who flogs or scourges (especially an official whose duty is to whip offenders) | Synonyms: scourger |
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| flogging | (noun) beating with a whip or strap or rope as a form of punishment | Synonyms: flagellation, lashing, tanning, whipping |
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| flood | (noun) the act of flooding; filling to overflowing | Synonyms: flowage |
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| (noun) a large flow | Synonyms: outpouring, overflow |
| (noun) light that is a source of artificial illumination having a broad beam; used in photography | Synonyms: flood lamp, floodlight, photoflood |
| (noun) the occurrence of incoming water (between a low tide and the following high tide) | Synonyms: flood tide, rising tide |
| (noun) the rising of a body of water and its overflowing onto normally dry land | Synonyms: alluvion, deluge, inundation |
| (noun) an overwhelming number or amount | Synonyms: deluge, inundation, torrent |
| floodgate | (noun) regulator consisting of a valve or gate that controls the rate of water flow through a sluice | Synonyms: head gate, penstock, sluice valve, sluicegate, water gate |
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| (noun) something that restrains a flood or outpouring | - |
| floodhead | (noun) a wall of water rushing ahead of the flood | - |
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| flooding | (noun) a technique used in behavior therapy; client is flooded with experiences of a particular kind until becoming either averse to them or numbed to them | Synonyms: implosion therapy |
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| floodlight | (noun) light that is a source of artificial illumination having a broad beam; used in photography | Synonyms: flood, flood lamp, photoflood |
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| floodplain | (noun) a low plain adjacent to a river that is formed chiefly of river sediment and is subject to flooding | Synonyms: flood plain |
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| floor | (noun) the inside lower horizontal surface (as of a room, hallway, tent, or other structure) | Synonyms: flooring |
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| (noun) a structure consisting of a room or set of rooms at a single position along a vertical scale | Synonyms: level, storey, story |
| (noun) a large room in a exchange where the trading is done | Synonyms: trading floor |
| (noun) the legislative hall where members debate and vote and conduct other business | - |
| (noun) the parliamentary right to address an assembly | - |
| (noun) a lower limit | Synonyms: base |
| (noun) the occupants of a floor | - |
| (noun) the bottom surface of any lake or other body of water | - |
| (noun) the ground on which people and animals move about | - |
| (noun) the lower inside surface of any hollow structure | - |
| floorboard | (noun) a board in the floor | Synonyms: floor board |
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| (noun) the floor of an automobile | - |
| flooring | (noun) the inside lower horizontal surface (as of a room, hallway, tent, or other structure) | Synonyms: floor |
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| (noun) building material used in laying floors | - |
| floorshow | (noun) a series of acts at a night club | Synonyms: cabaret, floor show |
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| floorwalker | (noun) an employee of a retail store who supervises sales personnel and helps with customer problems | Synonyms: shopwalker |
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| floozie | (noun) a prostitute who attracts customers by walking the streets | Synonyms: floozy, hooker, hustler, slattern, street girl, streetwalker |
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| floozy | (noun) a prostitute who attracts customers by walking the streets | Synonyms: floozie, hooker, hustler, slattern, street girl, streetwalker |
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| flop | (noun) the act of throwing yourself down; collapse; sink | Synonyms: collapse |
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| (noun) a complete failure | Synonyms: bust, fizzle |
| (noun) someone who is unsuccessful | Synonyms: dud, washout |
| (noun) an arithmetic operation performed on floating-point numbers | Synonyms: floating-point operation |
| flophouse | (noun) a cheap lodging house | Synonyms: dosshouse |
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| floppy | (noun) a small plastic magnetic disk enclosed in a stiff envelope with a radial slit; used to store data or programs for a microcomputer | Synonyms: diskette, floppy disk |
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| flora | (noun) (botany) a living organism lacking the power of locomotion | Synonyms: plant, plant life |
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| (noun) all the plant life in a particular region or period | Synonyms: botany, vegetation |
| florescence | (noun) the time and process of budding and unfolding of blossoms | Synonyms: anthesis, blossoming, efflorescence, flowering, inflorescence |
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| floret | (noun) a diminutive flower (especially one that is part of a composite flower) | Synonyms: floweret |
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| floriculture | (noun) the cultivation of flowering plants | Synonyms: flower gardening |
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| floridity | (noun) extravagant elaborateness | Synonyms: flamboyance, floridness, showiness |
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| floridness | (noun) extravagant elaborateness | Synonyms: flamboyance, floridity, showiness |
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| florilegium | (noun) an anthology of short literary pieces and poems and ballads etc. | Synonyms: garland, miscellany |
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| florin | (noun) formerly the basic unit of money in the Netherlands; equal to 100 cents | Synonyms: Dutch florin, guilder, gulden |
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| (noun) the basic unit of money in Suriname; equal to 100 cents | Synonyms: guilder, gulden |
| florist | (noun) a shop where flowers and ornamental plants are sold | Synonyms: florist shop, flower store |
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| (noun) someone who grows and deals in flowers | - |
| floss | (noun) a soft loosely twisted thread used in embroidery | - |
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| (noun) a soft thread for cleaning the spaces between the teeth | Synonyms: dental floss |
| flotation | (noun) financing a commercial enterprise by bond or stock shares | Synonyms: floatation |
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| (noun) the phenomenon of floating (remaining on the surface of a liquid without sinking) | Synonyms: floatation |
| flotilla | (noun) a fleet of small craft | - |
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| (noun) a United States Navy fleet consisting of two or more squadrons of small warships | - |
| flotsam | (noun) the floating wreckage of a ship | Synonyms: jetsam |
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| flounce | (noun) the act of walking with exaggerated jerky motions | - |
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| (noun) a strip of pleated material used as a decoration or a trim | Synonyms: frill, furbelow, ruffle |
| flounder | (noun) any of various European and non-European marine flatfish | - |
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| (noun) flesh of any of various American and European flatfish | - |
| flour | (noun) fine powdery foodstuff obtained by grinding and sifting the meal of a cereal grain | - |
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| flouriness | (noun) The state or condition of resembling flour, of being a fine soft powder. | - |
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| flourish | (noun) the act of waving | Synonyms: brandish |
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| (noun) a display of ornamental speech or language | - |
| (noun) a showy gesture | - |
| (noun) (music) a short lively tune played on brass instruments | Synonyms: fanfare, tucket |
| (noun) an ornamental embellishment in writing | - |
| flouter | (noun) someone who jeers or mocks or treats something with contempt or calls out in derision | Synonyms: jeerer, mocker, scoffer |
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| flow | (noun) the act of flowing or streaming; continuous progression | Synonyms: stream |
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| (noun) the motion characteristic of fluids (liquids or gases) | Synonyms: flowing |
| (noun) dominant course (suggestive of running water) of successive events or ideas | Synonyms: current, stream |
| (noun) any uninterrupted stream or discharge | - |
| (noun) the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause | Synonyms: catamenia, menses, menstruation, menstruum, period |
| (noun) something that resembles a flowing stream in moving continuously | Synonyms: stream |
| (noun) the amount of fluid that flows in a given time | Synonyms: flow rate, rate of flow |
| flowage | (noun) the act of flooding; filling to overflowing | Synonyms: flood |
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| (noun) a body of water that has been created by deliberately flooding an area | - |
| (noun) gradual internal motion or deformation of a solid body (as by heat) | - |
| flowchart | (noun) a diagram of the sequence of operations in a computer program or an accounting system | Synonyms: flow chart, flow diagram, flow sheet |
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| flower | (noun) a plant cultivated for its blooms or blossoms | - |
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| (noun) reproductive organ of angiosperm plants especially one having showy or colorful parts | Synonyms: bloom, blossom |
| (noun) the period of greatest prosperity or productivity | Synonyms: bloom, blossom, efflorescence, flush, heyday, peak, prime |
| flowerbed | (noun) a bed in which flowers are growing | Synonyms: bed of flowers, flower bed |
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| floweret | (noun) a diminutive flower (especially one that is part of a composite flower) | Synonyms: floret |
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| flowering | (noun) the time and process of budding and unfolding of blossoms | Synonyms: anthesis, blossoming, efflorescence, florescence, inflorescence |
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| (noun) a developmental process | Synonyms: unfolding |
| flowerpot | (noun) a container in which plants are cultivated | Synonyms: pot |
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| flowing | (noun) the motion characteristic of fluids (liquids or gases) | Synonyms: flow |
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| floxuridine | (noun) antineoplastic drug used to treat some cancers; can cause loss of hair | - |
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| foamflower | (noun) stoloniferous white-flowered spring-blooming woodland plant | Synonyms: coolwart, false miterwort, false mitrewort, Tiarella cordifolia |
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| foetology | (noun) the branch of medicine concerned with the fetus in the uterus | Synonyms: fetology |
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