| fetometry | (noun) measurement of a fetus (especially the diameter of the head) | Synonyms: foetometry |
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| fetoprotein | (noun) any of several antigens that occur naturally in the fetus and sometimes in adults with cancer | Synonyms: foetoprotein |
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| fetor | (noun) a distinctive odor that is offensively unpleasant | Synonyms: foetor, malodor, malodour, mephitis, reek, stench, stink |
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| fetoscope | (noun) a stethoscope placed on the pregnant woman's abdomen to listen for the fetal heartbeat | Synonyms: foetoscope |
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| fetoscopy | (noun) prenatal diagnosis that allows direct observation of a fetus in the uterus and the withdrawal of fetal blood | Synonyms: foetoscopy |
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| fetter | (noun) a shackle for the ankles or feet | Synonyms: hobble |
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| fetterbush | (noun) showy evergreen shrub of southeastern United States with shiny leaves and angled branches and clusters of pink to reddish flowers that resemble an umbel | Synonyms: fetter bush, Lyonia lucida, shiny lyonia |
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| (noun) ornamental evergreen shrub of southeastern United States having small white bell-shaped flowers | Synonyms: mountain andromeda, mountain fetterbush, Pieris floribunda |
| fettle | (noun) a state of fitness and good health | - |
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| fettuccine | (noun) pasta in flat strips wider than linguine | Synonyms: fettuccini |
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| fettuccini | (noun) pasta in flat strips wider than linguine | Synonyms: fettuccine |
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| fetus | (noun) an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal | Synonyms: foetus |
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| feud | (noun) a bitter quarrel between two parties | - |
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| 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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| feudatory | (noun) a person holding a fief; a person who owes allegiance and service to a feudal lord | Synonyms: liege, liege subject, liegeman, vassal |
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| fever | (noun) a state of nervous excitement | - |
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| (noun) a rise in the temperature of the body; frequently a symptom of infection | Synonyms: febricity, febrility, feverishness, pyrexia |
| feverfew | (noun) bushy aromatic European perennial herb having clusters of buttonlike white-rayed flower heads; valued traditionally for medicinal uses; sometimes placed in genus Chrysanthemum | Synonyms: Chrysanthemum parthenium, Tanacetum parthenium |
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| feverishness | (noun) a rise in the temperature of the body; frequently a symptom of infection | Synonyms: febricity, febrility, fever, pyrexia |
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| (noun) A state of wildly excited activity or emotion. | - |
| feverroot | (noun) coarse weedy American perennial herb with large usually perfoliate leaves and purple or dull red flowers | Synonyms: horse gentian, tinker's root, Triostium perfoliatum, wild coffee |
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| few | (noun) a small elite group | - |
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| fewness | (noun) the quality of being small in number | - |
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| fez | (noun) a felt cap (usually red) for a man; shaped like a flat-topped cone with a tassel that hangs from the crown | Synonyms: tarboosh |
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| 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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