| aerofoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: airfoil, control surface, surface |
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| afforestation | (noun) the conversion of bare or cultivated land into forest (originally for the purpose of hunting) | - |
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| airfoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: aerofoil, control surface, surface |
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| airforce | (noun) the airborne branch of a country's armed forces | Synonyms: air force |
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| alkylbenzenesulfonate | (noun) sulfonate of alkyl benzene | - |
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| asafoetida | (noun) the brownish gum resin of various plants; has strong taste and odor; formerly used as an antispasmodic | Synonyms: asafetida |
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| autofocus | (noun) an optical device for focussing a camera or other instrument automatically | - |
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| befooling | (noun) derision of someone or something as foolish or absurd or inconsistent | Synonyms: stultification |
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| befoulment | (noun) the state of being polluted | Synonyms: defilement, pollution |
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| bifocals | (noun) (plural) eyeglasses having two focal lengths, one for near vision and the other for far vision | - |
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| billfold | (noun) a pocket-size case for holding papers and paper money | Synonyms: notecase, pocketbook, wallet |
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| blindfold | (noun) a cloth used to cover the eyes | - |
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| bromoform | (noun) colorless liquid haloform CHBr3 | Synonyms: tribromomethane |
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| buffoon | (noun) a person who amuses others by ridiculous behavior | Synonyms: clown, goof, goofball, merry andrew |
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| (noun) a rude or vulgar fool | Synonyms: clown |
| buffoonery | (noun) acting like a clown or buffoon | Synonyms: clowning, frivolity, harlequinade, japery, prank |
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| bufo | (noun) any toad of the genus Bufo | - |
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| californium | (noun) a radioactive transuranic element; discovered by bombarding curium with alpha particles | Synonyms: atomic number 98, Cf |
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| carrefour | (noun) a junction where one street or road crosses another | Synonyms: crossing, crossroad, crossway, intersection |
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| cefoperazone | (noun) a parenteral cephalosporin (trade name Cefobid) used for severe infections | Synonyms: Cefobid |
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| cefotaxime | (noun) a parenteral cephalosporin (trade name Claforan) used for severe infections of the lungs or throat or ears or urinary tract | Synonyms: Claforan |
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| centerfold | (noun) a magazine center spread; especially a foldout of a large photograph or map or other feature | Synonyms: centrefold |
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| centrefold | (noun) a magazine center spread; especially a foldout of a large photograph or map or other feature | Synonyms: centerfold |
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| chiffon | (noun) a sheer fabric of silk or rayon | - |
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| chiffonier | (noun) a tall elegant chest of drawers | Synonyms: commode |
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| chloroform | (noun) a volatile liquid haloform (CHCl3); formerly used as an anesthetic | Synonyms: trichloromethane |
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| chlorpyrifos | (noun) a common organophosphate insecticide | - |
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| cinquefoil | (noun) an ornamental carving consisting of five arcs arranged in a circle | - |
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| (noun) any of a numerous plants grown for their five-petaled flowers; abundant in temperate regions; alleged to have medicinal properties | Synonyms: five-finger |
| clawfoot | (noun) a deformity of the foot characterized by an abnormally high arch and hyperextension of the toes which gives the foot the appearance of a claw | Synonyms: pes cavus |
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| clubfoot | (noun) congenital deformity of the foot usually marked by a curled shape or twisted position of the ankle and heel and toes | Synonyms: talipes |
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| cocksfoot | (noun) widely grown stout Old World hay and pasture grass | Synonyms: cockspur, Dactylis glomerata, orchard grass |
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| cofounder | (noun) one of a group of founders | - |
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| coltsfoot | (noun) perennial herb with large rounded leaves resembling a colt's foot and yellow flowers appearing before the leaves do; native to Europe but now nearly cosmopolitan; used medicinally especially formerly | Synonyms: Tussilago farfara |
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| (noun) tufted evergreen perennial herb having spikes of tiny white flowers and glossy green round to heart-shaped leaves that become coppery to maroon or purplish in fall | Synonyms: beetleweed, galax, Galax urceolata, galaxy, wandflower |
| comfort | (noun) the act of consoling; giving relief in affliction | Synonyms: consolation, solace |
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| (noun) assistance, such as that provided to an enemy or to a known criminal | - |
| (noun) bedding made of two layers of cloth filled with stuffing and stitched together | Synonyms: comforter, puff, quilt |
| (noun) a feeling of freedom from worry or disappointment | - |
| (noun) a state of being relaxed and feeling no pain | Synonyms: comfortableness |
| (noun) a freedom from financial difficulty that promotes a comfortable state | Synonyms: ease |
| (noun) satisfaction or physical well-being provided by a person or thing | - |
| comfortableness | (noun) a feeling of being at ease in a relationship | - |
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| (noun) a state of being relaxed and feeling no pain | Synonyms: comfort |
| comforter | (noun) bedding made of two layers of cloth filled with stuffing and stitched together | Synonyms: comfort, puff, quilt |
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| (noun) device used for an infant to suck or bite on | Synonyms: baby's dummy, pacifier, teething ring |
| (noun) a person who commiserates with someone who has had misfortune | Synonyms: sympathiser, sympathizer |
| (noun) a person who reduces the intensity (e.g., of fears) and calms and pacifies | Synonyms: allayer, reliever |
| comforts | (noun) things that make you comfortable and at ease | Synonyms: amenities, conveniences, creature comforts |
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| conformance | (noun) correspondence in form or appearance | Synonyms: conformity |
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| conformation | (noun) acting according to certain accepted standards | Synonyms: abidance, compliance, conformity |
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| (noun) any spatial attributes (especially as defined by outline) | Synonyms: configuration, contour, form, shape |
| (noun) a symmetrical arrangement of the parts of a thing | - |
| conformism | (noun) orthodoxy in thoughts and belief | Synonyms: conformity |
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| conformist | (noun) someone who conforms to established standards of conduct (especially in religious matters) | - |
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| conformity | (noun) acting according to certain accepted standards | Synonyms: abidance, compliance, conformation |
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| (noun) hardened conventionality | Synonyms: ossification |
| (noun) correspondence in form or appearance | Synonyms: conformance |
| (noun) orthodoxy in thoughts and belief | Synonyms: conformism |
| (noun) concurrence of opinion | Synonyms: accord, accordance |
| counterfoil | (noun) the part of a check that is retained as a record | Synonyms: check stub, stub |
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| counterreformation | (noun) a reformation intended to counter the results of a prior reformation | - |
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| countryfolk | (noun) people raised in or living in a rural environment; rustics | Synonyms: country people |
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| (noun) people living in the same country; compatriots | Synonyms: country people |
| crowfoot | (noun) any of various plants of the genus Ranunculus | Synonyms: butter-flower, buttercup, butterflower, goldcup, kingcup |
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| cuneiform | (noun) an ancient wedge-shaped script used in Mesopotamia and Persia | - |
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| daffodil | (noun) any of numerous varieties of Narcissus plants having showy often yellow flowers with a trumpet-shaped central crown | Synonyms: Narcissus pseudonarcissus |
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| defoliant | (noun) a chemical that is sprayed on plants and causes their leaves to fall off | - |
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| defoliation | (noun) causing the leaves of trees and other plants to fall off (as by the use of chemicals) | - |
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| (noun) the loss of foliage | - |
| defoliator | (noun) an insect that strips the leaves from plants | - |
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| deforestation | (noun) the removal of trees | Synonyms: disforestation |
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| (noun) the state of being clear of trees | - |
| deformation | (noun) the act of twisting or deforming the shape of something (e.g., yourself) | Synonyms: contortion |
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| (noun) a change for the worse | Synonyms: distortion |
| (noun) alteration in the shape or dimensions of an object as a result of the application of stress to it | - |
| deformity | (noun) an appearance that has been spoiled or is misshapen | Synonyms: disfiguration, disfigurement |
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| (noun) an affliction in which some part of the body is misshapen or malformed | Synonyms: malformation, misshapenness |
| discomfort | (noun) an uncomfortable feeling of mental painfulness or distress | Synonyms: irritation, soreness |
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| (noun) the state of being tense and feeling pain | Synonyms: uncomfortableness |
| disforestation | (noun) the removal of trees | Synonyms: deforestation |
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| disinformation | (noun) misinformation that is deliberately disseminated in order to influence or confuse rivals (foreign enemies or business competitors etc.) | - |
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| effort | (noun) earnest and conscientious activity intended to do or accomplish something | Synonyms: attempt, endeavor, endeavour, try |
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| (noun) use of physical or mental energy; hard work | Synonyms: elbow grease, exertion, sweat, travail |
| (noun) a notable achievement | Synonyms: exploit, feat |
| (noun) a series of actions advancing a principle or tending toward a particular end | Synonyms: campaign, cause, crusade, drive, movement |
| effortfulness | (noun) the quality of requiring deliberate effort | - |
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| effortlessness | (noun) the quality of requiring little effort | - |
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| eisteddfod | (noun) any of several annual Welsh festivals involving artistic competitions (especially in singing) | - |
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| enfolding | (noun) the action of enfolding something | Synonyms: involution |
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| enforcement | (noun) the act of enforcing; ensuring observance of or obedience to | - |
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| enforcer | (noun) one whose job it is to execute unpleasant tasks for a superior | Synonyms: hatchet man |
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| exfoliation | (noun) a thin flake of dead epidermis shed from the surface of the skin | Synonyms: scale, scurf |
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| (noun) the peeling off in flakes or scales of bark or dead skin | - |
| featherfoil | (noun) a plant of the genus Hottonia | Synonyms: feather-foil |
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| flatfoot | (noun) a foot afflicted with a fallen arch; abnormally flattened and spread out | Synonyms: pes planus, splayfoot |
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| (noun) a policeman who patrols a given region | Synonyms: patrolman |
| fluoroform | (noun) colorless gas haloform CHF3 (similar to chloroform) | Synonyms: trifluoromethane |
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| foal | (noun) a young horse | - |
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| foam | (noun) a mass of small bubbles formed in or on a liquid | Synonyms: froth |
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| (noun) a lightweight material in cellular form; made by introducing gas bubbles during manufacture | - |
| foamflower | (noun) stoloniferous white-flowered spring-blooming woodland plant | Synonyms: coolwart, false miterwort, false mitrewort, Tiarella cordifolia |
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| foaminess | (noun) the property of being foamy | - |
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| fob | (noun) short chain or ribbon attaching a pocket watch to a man's vest | Synonyms: watch chain, watch guard |
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| (noun) an adornment that hangs from a watch chain | - |
| (noun) a vest pocket to hold a pocket watch | Synonyms: watch pocket |
| focalisation | (noun) the act of bringing into focus | Synonyms: focalization, focusing |
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| (noun) the confinement of an infection to a limited area | Synonyms: focalization |
| focalization | (noun) the act of bringing into focus | Synonyms: focalisation, focusing |
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| (noun) the confinement of an infection to a limited area | Synonyms: focalisation |
| focus | (noun) maximum clarity or distinctness of an image rendered by an optical system | - |
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| (noun) maximum clarity or distinctness of an idea | - |
| (noun) the concentration of attention or energy on something | Synonyms: centering, centring, direction, focal point, focusing, focussing |
| (noun) a fixed reference point on the concave side of a conic section | - |
| (noun) a point of convergence of light (or other radiation) or a point from which it diverges | Synonyms: focal point |
| (noun) a central point or locus of an infection in an organism | Synonyms: focal point, nidus |
| (noun) special emphasis attached to something | Synonyms: stress |
| focusing | (noun) the act of bringing into focus | Synonyms: focalisation, focalization |
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| (noun) the concentration of attention or energy on something | Synonyms: centering, centring, direction, focal point, focus, focussing |
| focussing | (noun) the concentration of attention or energy on something | Synonyms: centering, centring, direction, focal point, focus, focusing |
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| fodder | (noun) coarse food (especially for livestock) composed of entire plants or the leaves and stalks of a cereal crop | - |
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| (noun) soldiers who are regarded as expendable in the face of artillery fire | Synonyms: cannon fodder, fresh fish |
| foe | (noun) a personal enemy | Synonyms: enemy |
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| (noun) an armed adversary (especially a member of an opposing military force) | Synonyms: enemy, foeman, opposition |
| foehn | (noun) a warm dry wind that blows down the northern slopes of the Alps | Synonyms: fohn |
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| foeman | (noun) an armed adversary (especially a member of an opposing military force) | Synonyms: enemy, foe, opposition |
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| foetology | (noun) the branch of medicine concerned with the fetus in the uterus | Synonyms: fetology |
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| foetometry | (noun) measurement of a fetus (especially the diameter of the head) | Synonyms: fetometry |
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| foetoprotein | (noun) any of several antigens that occur naturally in the fetus and sometimes in adults with cancer | Synonyms: fetoprotein |
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| foetor | (noun) a distinctive odor that is offensively unpleasant | Synonyms: fetor, malodor, malodour, mephitis, reek, stench, stink |
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| foetoscope | (noun) a stethoscope placed on the pregnant woman's abdomen to listen for the fetal heartbeat | Synonyms: fetoscope |
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| foetoscopy | (noun) prenatal diagnosis that allows direct observation of a fetus in the uterus and the withdrawal of fetal blood | Synonyms: fetoscopy |
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| foetus | (noun) an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal | Synonyms: fetus |
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| fog | (noun) confusion characterized by lack of clarity | Synonyms: daze, haze |
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| (noun) droplets of water vapor suspended in the air near the ground | - |
| (noun) an atmosphere in which visibility is reduced because of a cloud of some substance | Synonyms: fogginess, murk, murkiness |
| fogbank | (noun) a large mass of fog on the sea (as seen from a distance) | - |
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| fogey | (noun) someone whose style is out of fashion | Synonyms: dodo, fogy, fossil |
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| fogginess | (noun) the quality of being indistinct and without sharp outlines | Synonyms: blurriness, fuzziness, indistinctness, softness |
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| (noun) an atmosphere in which visibility is reduced because of a cloud of some substance | Synonyms: fog, murk, murkiness |
| foghorn | (noun) a warning device consisting of a horn that generates a loud low tone | - |
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| (noun) a loud low warning signal that can be heard by fogbound ships | Synonyms: fogsignal |
| foglamp | (noun) headlight that provides strong beam for use in foggy weather | - |
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| fogsignal | (noun) a loud low warning signal that can be heard by fogbound ships | Synonyms: foghorn |
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| fogy | (noun) someone whose style is out of fashion | Synonyms: dodo, fogey, fossil |
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| fohn | (noun) a warm dry wind that blows down the northern slopes of the Alps | Synonyms: foehn |
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| foible | (noun) the weaker part of a sword's blade from the forte to the tip | - |
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| (noun) a behavioral attribute that is distinctive and peculiar to an individual | Synonyms: idiosyncrasy, mannerism |
| (noun) a minor flaw or shortcoming in character or behavior. | - |
| foil | (noun) a light slender flexible sword tipped by a button | - |
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| (noun) a piece of thin and flexible sheet metal | - |
| (noun) picture consisting of a positive photograph or drawing on a transparent base; viewed with a projector | Synonyms: transparency |
| (noun) a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through | Synonyms: hydrofoil |
| (noun) anything that serves by contrast to call attention to another thing's good qualities | Synonyms: enhancer |
| foiling | (noun) an act of hindering someone's plans or efforts | Synonyms: frustration, thwarting |
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