| fennel | (noun) fennel seeds are ground and used as a spice or as an ingredient of a spice mixture | - |
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| (noun) leaves used for seasoning | Synonyms: common fennel |
| (noun) aromatic bulbous stem base eaten cooked or raw in salads | Synonyms: finocchio, Florence fennel |
| (noun) any of several aromatic herbs having edible seeds and leaves and stems | - |
| fenoprofen | (noun) a nonsteroidal anti-inflammatory drug (trade name Nalfon) used in the treatment of arthritis and other painful inflammatory disorders | Synonyms: fenoprofen calcium, Nalfon |
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| fenugreek | (noun) aromatic seeds used as seasoning especially in curry | Synonyms: fenugreek seed |
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| (noun) annual herb or southern Europe and eastern Asia having off-white flowers and aromatic seeds used medicinally and in curry | Synonyms: Greek clover, Trigonella foenumgraecum |
| feoff | (noun) a piece of land held under the feudal system | Synonyms: fief |
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| feral | (adjective) wild and menacing | Synonyms: ferine, savage |
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| fergusonite | (noun) a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals | - |
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| feria | (noun) (in Spanish speaking regions) a local festival or fair, usually in honor of some patron saint | - |
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| (noun) a weekday on which no festival or holiday is celebrated | - |
| ferial | (adjective) of or relating to or being a feria | - |
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| ferine | (adjective) wild and menacing | Synonyms: feral, savage |
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| fermata | (noun) (music) a prolongation of unspecified length on a note or chord or rest | - |
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| (noun) a musical notation (over a note or chord or rest) that indicates it is to be prolonged by an unspecified amount | - |
| ferment | (noun) a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol | Synonyms: fermentation, fermenting, zymolysis, zymosis |
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| (noun) a state of agitation or turbulent change or development | Synonyms: agitation, fermentation, tempestuousness, unrest |
| (noun) a substance capable of bringing about fermentation | - |
| (verb) go sour or spoil | Synonyms: sour, turn, work |
| (verb) cause to undergo fermentation | Synonyms: work |
| (verb) work up into agitation or excitement | - |
| (verb) be in an agitated or excited state | - |
| fermentable | (adjective) capable of being fermented | - |
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| fermentation | (noun) a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol | Synonyms: ferment, fermenting, zymolysis, zymosis |
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| (noun) a state of agitation or turbulent change or development | Synonyms: agitation, ferment, tempestuousness, unrest |
| fermenting | (noun) a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol | Synonyms: ferment, fermentation, zymolysis, zymosis |
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| fermentologist | (noun) a specialist in wine making | Synonyms: enologist, oenologist |
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| fermi | (noun) a metric unit of length equal to one quadrillionth of a meter | Synonyms: femtometer, femtometre |
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| fermion | (noun) any particle that obeys Fermi-Dirac statistics and is subject to the Pauli exclusion principle | - |
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| fermium | (noun) a radioactive transuranic metallic element produced by bombarding plutonium with neutrons | Synonyms: atomic number 100, Fm |
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| fern | (noun) any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores | - |
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| ferned | (adjective) abounding in or covered with ferns | Synonyms: ferny |
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| fernless | (adjective) devoid of ferns | - |
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| fernlike | (adjective) resembling ferns especially in leaf shape | Synonyms: ferny |
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| ferny | (adjective) abounding in or covered with ferns | Synonyms: ferned |
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| (adjective) resembling ferns especially in leaf shape | Synonyms: fernlike |
| ferocious | (adjective) marked by extreme and violent energy | Synonyms: fierce, furious, savage |
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| ferociously | (adverb) in a physically fierce manner | Synonyms: fiercely |
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| ferociousness | (noun) the trait of extreme cruelty | Synonyms: brutality, savagery, viciousness |
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| ferocity | (noun) the property of being wild or turbulent | Synonyms: fierceness, furiousness, fury, vehemence, violence, wildness |
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| ferret | (noun) domesticated albino variety of the European polecat bred for hunting rats and rabbits | - |
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| (noun) musteline mammal of prairie regions of United States; nearly extinct | Synonyms: black-footed ferret, Mustela nigripes |
| (verb) search and discover through persistent investigation | Synonyms: ferret out |
| (verb) hunt with ferrets | - |
| (verb) hound or harry relentlessly | - |
| ferric | (adjective) of or relating to or containing iron | Synonyms: ferrous |
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| ferricyanide | (noun) salt of ferricyanic acid obtained by oxidation of a ferrocyanide | - |
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| ferrimagnetism | (noun) a phenomenon in ferrites where there can be incomplete cancellation of antiferromagnetic arranged spins giving a net magnetic moment | - |
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| ferrite | (noun) a solid solution in which alpha iron is the solvent | - |
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| (noun) a magnetic allotrope of iron; stable below 906 degrees centigrade | Synonyms: alpha-Fe, alpha-ferrite |
| ferritin | (noun) a protein containing 20% iron that is found in the intestines and liver and spleen; it is one of the chief forms in which iron is stored in the body | - |
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| ferrocerium | (noun) a pyrophoric alloy of iron with cerium; used for lighter flints | - |
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| ferroconcrete | (noun) concrete with metal and/or mesh added to provide extra support against stresses | Synonyms: reinforced concrete |
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| ferrocyanide | (noun) salt of ferrocyanic acid usually obtained by a reaction of a cyanide with iron sulphate | - |
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| ferromagnet | (noun) any material that has ferromagnetic properties. | - |
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| ferromagnetic | (adjective) relating to or demonstrating ferromagnetism | - |
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| ferromagnetism | (noun) phenomenon exhibited by materials like iron (nickel or cobalt) that become magnetized in a magnetic field and retain their magnetism when the field is removed | - |
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| ferrous | (adjective) of or relating to or containing iron | Synonyms: ferric |
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| ferrule | (noun) a metal cap or band placed on a wooden pole to prevent splitting | Synonyms: collet |
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| ferry | (noun) transport by boat or aircraft | Synonyms: ferrying |
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| (noun) a boat that transports people or vehicles across a body of water and operates on a regular schedule | Synonyms: ferryboat |
| (verb) travel by ferry | - |
| (verb) transport by ferry | - |
| (verb) transport from one place to another | - |
| ferryboat | (noun) a boat that transports people or vehicles across a body of water and operates on a regular schedule | Synonyms: ferry |
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| ferrying | (noun) transport by boat or aircraft | Synonyms: ferry |
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| ferryman | (noun) a man who operates a ferry | - |
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| fertile | (adjective) capable of reproducing | - |
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| (adjective) marked by great fruitfulness | Synonyms: fat, productive, rich |
| (adjective) bearing in abundance especially offspring | Synonyms: prolific |
| (adjective) intellectually productive | Synonyms: fecund, prolific |
| fertilisation | (noun) creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant | Synonyms: fecundation, fertilization, impregnation |
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| (noun) making fertile as by applying fertilizer or manure | Synonyms: dressing, fecundation, fertilization |
| fertilise | (verb) introduce semen into (a female) | Synonyms: fecundate, fertilize, inseminate |
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| (verb) provide with fertilizers or add nutrients to | Synonyms: feed, fertilize |
| (verb) make fertile or productive | Synonyms: fecundate, fertilize |
| fertiliser | (noun) any substance such as manure or a mixture of nitrates used to make soil more fertile | Synonyms: fertilizer, plant food |
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| fertility | (noun) the property of producing abundantly and sustaining vigorous and luxuriant growth | Synonyms: prolificacy, rankness, richness |
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| (noun) the state of being fertile; capable of producing offspring | Synonyms: fecundity |
| (noun) the ratio of live births in an area to the population of that area; expressed per 1000 population per year | Synonyms: birth rate, birthrate, fertility rate, natality |
| fertilizable | (adjective) capable of being fertilized | - |
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| fertilization | (noun) creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant | Synonyms: fecundation, fertilisation, impregnation |
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| (noun) making fertile as by applying fertilizer or manure | Synonyms: dressing, fecundation, fertilisation |
| fertilize | (verb) introduce semen into (a female) | Synonyms: fecundate, fertilise, inseminate |
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| (verb) provide with fertilizers or add nutrients to | Synonyms: feed, fertilise |
| (verb) make fertile or productive | Synonyms: fecundate, fertilise |
| fertilizer | (noun) any substance such as manure or a mixture of nitrates used to make soil more fertile | Synonyms: fertiliser, plant food |
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| ferule | (noun) a switch (a stick or cane or flat paddle) used to punish children | - |
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| fervency | (noun) feelings of great warmth and intensity | Synonyms: ardor, ardour, fervidness, fervor, fervour, fire |
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| fervent | (adjective) (archaic) extremely hot, burning, or glowing | Synonyms: fervid |
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| (adjective) characterized by intense emotion | Synonyms: ardent, fervid, fiery, impassioned, perfervid, torrid |
| fervently | (adverb) with passionate fervor | Synonyms: fervidly, fierily |
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| fervid | (adjective) (archaic) extremely hot, burning, or glowing | Synonyms: fervent |
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| (adjective) characterized by intense emotion | Synonyms: ardent, fervent, fiery, impassioned, perfervid, torrid |
| fervidly | (adverb) with passionate fervor | Synonyms: fervently, fierily |
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| fervidness | (noun) feelings of great warmth and intensity | Synonyms: ardor, ardour, fervency, fervor, fervour, fire |
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| fervor | (noun) feelings of great warmth and intensity | Synonyms: ardor, ardour, fervency, fervidness, fervour, fire |
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| (noun) the state of being emotionally aroused and worked up | Synonyms: excitation, excitement, fervour, inflammation |
| fervour | (noun) feelings of great warmth and intensity | Synonyms: ardor, ardour, fervency, fervidness, fervor, fire |
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| (noun) the state of being emotionally aroused and worked up | Synonyms: excitation, excitement, fervor, inflammation |
| feryaz | (noun) a broad kaftan with long sleeves, worn by the nobility in Russia in the 16th and 17th centuries. | - |
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| fescue | (noun) grass with wide flat leaves cultivated in Europe and America for permanent pasture and hay and for lawns | Synonyms: fescue grass, Festuca elatior, meadow fescue |
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| fess | (noun) (heraldry) an ordinary consisting of a broad horizontal band across a shield | Synonyms: fesse |
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| fesse | (noun) (heraldry) an ordinary consisting of a broad horizontal band across a shield | Synonyms: fess |
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| festal | (adjective) offering fun and gaiety | Synonyms: festive, gay, merry |
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| fester | (noun) a sore that has become inflamed and formed pus | Synonyms: suppurating sore |
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| (verb) ripen and generate pus | Synonyms: maturate, suppurate |
| festering | (noun) a fluid product of inflammation | Synonyms: ichor, purulence, pus, sanies, suppuration |
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| (noun) (medicine) the formation of morbific matter in an abscess or a vesicle and the discharge of pus | Synonyms: maturation, suppuration |
| festinate | (verb) act at high speed | Synonyms: hasten, hurry, look sharp, rush |
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| festination | (noun) involuntary shortening of stride and quickening of gait that occurs in some diseases (e.g., Parkinson's disease) | - |
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| festival | (noun) an organized series of acts and performances (usually in one place) | Synonyms: fete |
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| (noun) a day or period of time set aside for feasting and celebration | - |
| festive | (adjective) offering fun and gaiety | Synonyms: festal, gay, merry |
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| festivity | (noun) any joyous diversion | Synonyms: celebration |
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| festoon | (noun) flower chains suspended in curves between points as a decoration | Synonyms: festoonery |
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| (noun) an embellishment consisting of a decorative representation of a string of flowers suspended between two points; used on pottery or in architectural work | - |
| (noun) a curtain of fabric draped and bound at intervals to form graceful curves | - |
| (verb) decorate with strings of flowers | - |
| festoonery | (noun) flower chains suspended in curves between points as a decoration | Synonyms: festoon |
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| festschrift | (noun) a collection of writings published in honor of a scholar | - |
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| fetal | (adjective) of or relating to a fetus | Synonyms: foetal |
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| fetch | (noun) the action of fetching | - |
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| (verb) go or come after and bring or take back | Synonyms: bring, convey, get |
| (verb) remove | - |
| (verb) be sold for a certain price | Synonyms: bring, bring in |
| fetching | (adjective) very attractive; capturing interest | Synonyms: taking, winning |
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| fete | (noun) an organized series of acts and performances (usually in one place) | Synonyms: festival |
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| (noun) an elaborate party (often outdoors) | Synonyms: feast, fiesta |
| (verb) have a celebration | Synonyms: celebrate |
| feterita | (noun) a Sudanese sorghum having exceptionally large soft white grains | Synonyms: federita, Sorghum vulgare caudatum |
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| fetich | (noun) excessive or irrational devotion to some activity | Synonyms: fetish |
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| (noun) a charm superstitiously believed to embody magical powers | Synonyms: fetish, hoodoo, juju, voodoo |
| fetichism | (noun) sexual arousal or gratification resulting from handling a fetish (or a specific part of the body other than the sexual organs) | Synonyms: fetishism |
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| (noun) a belief in the magical power of fetishes (or the worship of a fetish) | Synonyms: fetishism |
| feticide | (noun) the act of destroying a fetus | Synonyms: aborticide |
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| fetid | (adjective) offensively malodorous | Synonyms: foetid, foul-smelling, foul, funky, ill-scented, noisome, smelly, stinking |
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| fetidness | (noun) the attribute of having a strong offensive smell | Synonyms: foulness, malodorousness, rankness, stinkiness |
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| fetish | (noun) excessive or irrational devotion to some activity | Synonyms: fetich |
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| (noun) a charm superstitiously believed to embody magical powers | Synonyms: fetich, hoodoo, juju, voodoo |
| (noun) a form of sexual desire in which gratification depends to an abnormal degree on some object or item of clothing or part of the body | - |
| fetishism | (noun) sexual arousal or gratification resulting from handling a fetish (or a specific part of the body other than the sexual organs) | Synonyms: fetichism |
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| (noun) a belief in the magical power of fetishes (or the worship of a fetish) | Synonyms: fetichism |
| fetishist | (noun) one who engages in fetishism (especially of a sexual nature) | - |
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| fetishize | (verb) make a fetish of | - |
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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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| 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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| (verb) restrain with fetters | Synonyms: shackle |