| feisty | (adjective) quick to take offense | Synonyms: huffy, thin-skinned, touchy |
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| (adjective) showing courage | Synonyms: plucky, spunky |
| felafel | (noun) small croquette of mashed chick peas or fava beans seasoned with sesame seeds | Synonyms: falafel |
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| feldspar | (noun) any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium | Synonyms: felspar |
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| felicitate | (verb) express congratulations | Synonyms: congratulate |
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| felicitation | (noun) the act of acknowledging that someone has an occasion for celebration | Synonyms: congratulation |
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| (noun) (usually plural) an expression of pleasure at the success or good fortune of another | Synonyms: congratulation |
| felicitous | (adjective) exhibiting an agreeably appropriate manner or style | - |
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| (adjective) marked by good fortune | Synonyms: happy |
| felicitously | (adverb) in a felicitous manner | - |
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| felicitousness | (noun) pleasing and appropriate manner or style (especially manner or style of expression) | Synonyms: felicity |
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| felicity | (noun) pleasing and appropriate manner or style (especially manner or style of expression) | Synonyms: felicitousness |
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| (noun) state of well-being characterized by emotions ranging from contentment to intense joy | Synonyms: happiness |
| felid | (noun) any of various lithe-bodied roundheaded fissiped mammals, many with retractile claws | Synonyms: feline |
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| feline | (adjective) of or relating to cats | - |
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| (noun) any of various lithe-bodied roundheaded fissiped mammals, many with retractile claws | Synonyms: felid |
| fell | (adjective) (of persons or their actions) able or disposed to inflict pain or suffering | Synonyms: barbarous, brutal, cruel, roughshod, savage, vicious |
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| (noun) the act of felling something (as a tree) | - |
| (noun) seam made by turning under or folding together and stitching the seamed materials to avoid rough edges | Synonyms: felled seam |
| (noun) the dressed skin of an animal (especially a large animal) | Synonyms: hide |
| (verb) cause to fall by or as if by delivering a blow | Synonyms: cut down, drop, strike down |
| (verb) sew a seam by folding the edges | - |
| (verb) pass away rapidly | Synonyms: fly, vanish |
| fella | (noun) a boy or man | Synonyms: blighter, bloke, chap, cuss, feller, fellow, gent, lad |
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| fellah | (noun) an agricultural laborer in Arab countries | - |
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| fellate | (verb) provide sexual gratification through oral stimulation | Synonyms: blow, go down on, suck |
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| fellatio | (noun) oral stimulation of the penis | Synonyms: fellation |
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| fellation | (noun) oral stimulation of the penis | Synonyms: fellatio |
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| feller | (noun) a boy or man | Synonyms: blighter, bloke, chap, cuss, fella, fellow, gent, lad |
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| (noun) a person who fells trees | Synonyms: faller, logger, lumberjack, lumberman |
| 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 |
| felly | (noun) rim (or part of the rim) into which spokes are inserted | Synonyms: felloe |
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| 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 |
| felonious | (adjective) involving or being or having the nature of a crime | Synonyms: criminal |
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| 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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| felspar | (noun) any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium | Synonyms: feldspar |
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| felt | (noun) a fabric made of compressed matted animal fibers | - |
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| (verb) change texture so as to become matted and felt-like | Synonyms: felt up, mat, mat up, matt-up, matte, matte up |
| (verb) cover with felt | - |
| (verb) mat together and make felt-like | - |
| felted | (adjective) made by combining fibers with a binder using heat and pressure | - |
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| felucca | (noun) a fast narrow sailing ship of the Mediterranean | - |
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| felwort | (noun) gentian of Europe and China having creamy white flowers with fringed corollas | Synonyms: gentianella amarella |
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| female | (adjective) being the sex (of plant or animal) that produces fertilizable gametes (ova) from which offspring develop | - |
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| (adjective) for or pertaining to or composed of women or girls | - |
| (adjective) characteristic of or peculiar to a woman | Synonyms: distaff |
| (noun) an animal that produces gametes (ova) that can be fertilized by male gametes (spermatozoa) | - |
| (noun) a person who belongs to the sex that can have babies | Synonyms: female person |
| femaleness | (noun) the properties characteristic of the female sex | Synonyms: feminineness |
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| feminine | (adjective) associated with women and not with men | - |
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| (adjective) female (of grammatical gender) | - |
| (adjective) befitting or characteristic of a woman especially a mature woman | Synonyms: womanly |
| (adjective) (music or poetry) ending on an unaccented beat or syllable | - |
| (noun) a gender that refers chiefly (but not exclusively) to females or to objects classified as female | - |
| feminineness | (noun) the properties characteristic of the female sex | Synonyms: femaleness |
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| femininity | (noun) the trait of behaving in ways considered typical for women | Synonyms: muliebrity |
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| feminisation | (noun) the process of becoming feminized; the development of female characteristics (loss of facial hair or breast enlargement) in a male because of hormonal disorders or castration | Synonyms: feminization |
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| feminise | (verb) to give a (more) feminine, effeminate, or womanly quality or appearance to | Synonyms: effeminise, effeminize, feminize, womanize |
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| (verb) assume (more) feminine characteristics | Synonyms: feminize |
| feminism | (noun) the movement aimed at equal rights for women | Synonyms: feminist movement, women's lib, women's liberation movement |
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| (noun) a doctrine that advocates equal rights for women | - |
| feminist | (adjective) of or relating to or advocating equal rights for women | - |
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| (noun) a supporter of feminism | Synonyms: libber, women's liberationist, women's rightist |
| feminization | (noun) the process of becoming feminized; the development of female characteristics (loss of facial hair or breast enlargement) in a male because of hormonal disorders or castration | Synonyms: feminisation |
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| feminize | (verb) to give a (more) feminine, effeminate, or womanly quality or appearance to | Synonyms: effeminise, effeminize, feminise, womanize |
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| (verb) assume (more) feminine characteristics | Synonyms: feminise |
| femoral | (adjective) of or relating to or near the femur or thigh | - |
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| femoris | (noun) the longest and thickest bone of the human skeleton; extends from the pelvis to the knee | Synonyms: femur, thighbone |
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| femtochemistry | (noun) the branch of chemistry that studies elementary (often very fast) chemical reactions as they occur; the experimental methods are often based on the use of femtosecond laser pulses | - |
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| femtometer | (noun) a metric unit of length equal to one quadrillionth of a meter | Synonyms: femtometre, fermi |
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| femtometre | (noun) a metric unit of length equal to one quadrillionth of a meter | Synonyms: femtometer, fermi |
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| femtosecond | (noun) one quadrillionth (10^-15) of a second; one thousandth of a picosecond | - |
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| femtovolt | (noun) a unit of potential equal to one quadrillionth of a volt (or one thousandth of a picovolt) | - |
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| femur | (noun) the longest and thickest bone of the human skeleton; extends from the pelvis to the knee | Synonyms: femoris, thighbone |
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| fen | (noun) low-lying wet land with grassy vegetation; usually is a transition zone between land and water | Synonyms: fenland, marsh, marshland |
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| (noun) 100 fen equal 1 yuan in China | - |
| fence | (noun) a barrier that serves to enclose an area | Synonyms: fencing |
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| (noun) a dealer in stolen property | - |
| (verb) have an argument about something | Synonyms: argue, contend, debate |
| (verb) surround with a wall in order to fortify | Synonyms: fence in, palisade, surround, wall |
| (verb) fight with fencing swords | - |
| (verb) enclose with a fence | Synonyms: fence in |
| (verb) receive stolen goods | - |
| fencelike | (adjective) resembling a fence | - |
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| fencer | (noun) someone skilled at fencing | Synonyms: swordsman |
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| fencesitter | (noun) a neutral or uncommitted person (especially in politics) | Synonyms: independent, mugwump |
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| fencing | (noun) the art or sport of fighting with swords (especially the use of foils or epees or sabres to score points under a set of rules) | - |
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| (noun) a barrier that serves to enclose an area | Synonyms: fence |
| (noun) material for building fences | Synonyms: fencing material |
| fend | (verb) withstand the force of something | Synonyms: resist, stand |
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| (verb) try to manage without help | - |
| fender | (noun) a cushion-like device that reduces shock due to an impact | Synonyms: buffer |
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| (noun) a barrier that surrounds the wheels of a vehicle to block splashing water or mud | Synonyms: wing |
| (noun) a low metal guard to confine falling coals to a hearth | - |
| (noun) an inclined metal frame at the front of a locomotive to clear the track | Synonyms: buffer, cowcatcher, pilot |
| fenestella | (noun) oval or circular opening; to allow light into a dome or vault | Synonyms: lunette |
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| fenestra | (noun) a small opening covered with membrane (especially one in the bone between the middle and inner ear) | - |
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| fenestral | (adjective) of or relating to windows | - |
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| (adjective) of or relating to or having a fenestra | - |
| fenestration | (noun) surgical procedure that creates a new fenestra to the cochlea in order to restore hearing lost because of osteosclerosis | - |
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| (noun) the arrangement of windows in a building | - |
| fenland | (noun) low-lying wet land with grassy vegetation; usually is a transition zone between land and water | Synonyms: fen, marsh, marshland |
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| 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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