| 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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| alehoof | (noun) trailing European aromatic plant of the mint family having rounded leaves and small purplish flowers often grown in hanging baskets; naturalized in North America; sometimes placed in genus Nepeta | Synonyms: field balm, gill-over-the-ground, Glechoma hederaceae, ground ivy, Nepeta hederaceae, runaway robin |
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| aloft | (adverb) in the higher atmosphere above the earth | - |
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| (adverb) at or to great height; high up in or into the air | - |
| (adverb) at or on or to the masthead or upper rigging of a ship | - |
| (adverb) upward | - |
| aloof | (adjective) remote in manner | Synonyms: distant, upstage |
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| (adverb) in an aloof manner | - |
| aloofness | (noun) a disposition to be distant and unsympathetic in manner | Synonyms: remoteness, standoffishness, withdrawnness |
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| (noun) indifference by personal withdrawal | Synonyms: distance |
| autofluorescence | (noun) self-induced fluorescence | - |
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| autofluorescent | (adjective) emitting light via self-induced fluorescence | - |
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| autofocus | (noun) an optical device for focussing a camera or other instrument automatically | - |
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| benzofuran | (noun) a colorless oily compound extracted from coal tar and used in manufacturing synthetic resins | Synonyms: coumarone, cumarone |
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| biofeedback | (noun) a training program in which a person is given information about physiological processes (heart rate or blood pressure) that is not normally available with the goal of gaining conscious control of them | - |
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| bioflavinoid | (noun) a vitamin that maintains the resistance of cell and capillary walls to permeation | Synonyms: citrin, vitamin P |
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| blastoff | (noun) the launching of a missile or spacecraft to a specified destination | Synonyms: shot |
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| boffin | (noun) (British slang) a scientist or technician engaged in military research | - |
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| boffo | (adjective) resoundingly successful and popular | - |
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| bombproof | (adjective) able to resist the explosive force of bombs and shells | Synonyms: shellproof |
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| (noun) a chamber (often underground) reinforced against bombing and provided with food and living facilities; used during air raids | Synonyms: air-raid shelter, bomb shelter |
| (verb) make safe against bombings | - |
| bromoform | (noun) colorless liquid haloform CHBr3 | Synonyms: tribromomethane |
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| buffalofish | (noun) any of several large suckers of the Mississippi valley | Synonyms: buffalo fish |
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| (noun) large carp-like North American fish | - |
| bulletproof | (adjective) not penetrable by bullets | - |
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| (adjective) without flaws or loopholes | Synonyms: ironclad, unassailable, unshakable, watertight |
| (verb) make bulletproof | - |
| burglarproof | (adjective) secure against burglary | - |
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| childproof | (verb) make safe against children | Synonyms: child-proof |
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| chlorofluorocarbon | (noun) a fluorocarbon with chlorine; formerly used as a refrigerant and as a propellant in aerosol cans | Synonyms: CFC |
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| chloroform | (noun) a volatile liquid haloform (CHCl3); formerly used as an anesthetic | Synonyms: trichloromethane |
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| (verb) anesthetize with chloroform | - |
| chlorofucin | (noun) the chlorophyll present in brown algae, diatoms, and flagellates | Synonyms: chlorophyll c |
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| ciprofloxacin | (noun) an oral antibiotic (trade name Cipro) used against serious bacterial infections of the skin or respiratory tract or urinary tract or bones or joints | Synonyms: Cipro |
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| clofibrate | (noun) a drug (trade name Atromid-S) that reduces lipids in the blood serum; used to treat some cardiovascular diseases | Synonyms: Atromid-S |
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| cockloft | (noun) a small loft or garret | - |
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| cofactor | (noun) a substance (as a coenzyme) that must join with another to produce a given result | - |
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| coffee | (noun) a medium brown to dark-brown color | Synonyms: burnt umber, chocolate, deep brown, umber |
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| (noun) a beverage consisting of an infusion of ground coffee beans | Synonyms: java |
| (noun) a seed of the coffee tree; ground to make coffee | Synonyms: coffee bean, coffee berry |
| (noun) any of several small trees and shrubs native to the tropical Old World yielding coffee beans | Synonyms: coffee tree |
| coffeeberry | (noun) evergreen shrub of western United States bearing small red or black fruits | Synonyms: California buckthorn, California coffee, Rhamnus californicus |
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| coffeecake | (noun) a cake or sweet bread usually served with coffee | Synonyms: coffee cake |
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| coffeehouse | (noun) a small restaurant where drinks and snacks are sold | Synonyms: cafe, coffee bar, coffee shop |
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| coffeepot | (noun) tall pot in which coffee is brewed | - |
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| coffer | (noun) a chest especially for storing valuables | - |
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| (noun) an ornamental sunken panel in a ceiling or dome | Synonyms: caisson, lacunar |
| cofferdam | (noun) large watertight chamber used for construction under water | Synonyms: caisson, pneumatic caisson |
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| coffin | (noun) box in which a corpse is buried or cremated | Synonyms: casket |
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| (verb) place into a coffin | - |
| cofounder | (noun) one of a group of founders | - |
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| corticofugal | (adjective) of a nerve fiber passing outward from the cerebral cortex | Synonyms: corticifugal, corticoefferent |
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| counteroffensive | (noun) a large scale offensive (more than a counterattack) undertaken by a defending force to seize the initiative from an attacking force | - |
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| counteroffer | (noun) an offer made by someone who has rejected a prior offer | - |
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| creaseproof | (adjective) of fabric that does not wrinkle easily | Synonyms: crease-resistant, wrinkle-resistant, wrinkleproof |
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| croft | (noun) a small farm worked by a crofter | - |
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| crofter | (noun) an owner or tenant of a small farm in Great Britain | - |
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| cuckooflower | (noun) a bitter cress of Europe and America | Synonyms: Cardamine pratensis, cuckoo flower, lady's smock, meadow cress |
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| cutoff | (noun) a route shorter than the usual one | Synonyms: crosscut, shortcut |
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| (noun) a device that terminates the flow in a pipe | - |
| (noun) a designated limit beyond which something cannot function or must be terminated | - |
| dinoflagellate | (noun) chiefly marine protozoa having two flagella; a chief constituent of plankton | - |
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| disproof | (noun) the act of determining that something is false | Synonyms: falsification, falsifying, refutal, refutation |
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| (noun) any evidence that helps to establish the falsity of something | Synonyms: falsification, refutation |
| doff | (verb) to take off from the body or head | - |
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| doofus | (noun) a stupid incompetent person | Synonyms: dimwit, half-wit, nitwit |
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| ecofriendly | (adjective) Good for the environment | - |
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| enfeoff | (verb) put in possession of land in exchange for a pledge of service, in feudal society | - |
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| enfeoffment | (noun) under the feudal system, the deed by which a person was given land in exchange for a pledge of service | - |
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| falloff | (noun) a noticeable deterioration in performance or quality | Synonyms: drop-off, falling off, slack, slump |
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| 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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| feoff | (noun) a piece of land held under the feudal system | Synonyms: fief |
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| fireproof | (adjective) impervious to damage by fire | - |
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| (verb) make resistant to fire | - |
| flameproof | (adjective) resistant to catching fire | Synonyms: flame-retardant |
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| fluoroform | (noun) colorless gas haloform CHF3 (similar to chloroform) | Synonyms: trifluoromethane |
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| flurbiprofen | (noun) a nonsteroidal anti-inflammatory drug (trade name Ansaid) that is administered only orally | Synonyms: Ansaid |
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| foolproof | (adjective) not liable to failure | Synonyms: unfailing |
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| (verb) proof against human misuse or error | Synonyms: goof-proof, goofproof |
| ganof | (noun) (Yiddish) a thief or dishonest person or scoundrel (often used as a general term of abuse) | Synonyms: ganef, gonif, goniff |
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| gofer | (noun) an employee whose duties include running errands | - |
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| goffer | (noun) an ornamental frill made by pressing pleats | Synonyms: gauffer |
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| (noun) an iron used to press pleats and ridges | Synonyms: gauffer, gauffering iron, goffering iron |
| (noun) a zealously energetic person (especially a salesman) | Synonyms: gopher |
| (verb) make wavy with a heated goffering iron | Synonyms: gauffer |
| goof | (noun) a man who is a stupid incompetent fool | Synonyms: bozo, cuckoo, fathead, goofball, goose, jackass, twat, zany |
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| (noun) a person who amuses others by ridiculous behavior | Synonyms: buffoon, clown, goofball, merry andrew |
| (verb) commit a faux pas or a fault or make a serious mistake | Synonyms: blunder, boob, drop the ball, sin |
| goofball | (noun) a man who is a stupid incompetent fool | Synonyms: bozo, cuckoo, fathead, goof, goose, jackass, twat, zany |
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| (noun) a person who amuses others by ridiculous behavior | Synonyms: buffoon, clown, goof, merry andrew |
| goofproof | (verb) proof against human misuse or error | Synonyms: foolproof, goof-proof |
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| goofy | (adjective) ludicrous, foolish | Synonyms: silly, wacky, whacky, zany |
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| greaseproof | (adjective) resistant to penetration by grease or oil or wax | - |
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| griseofulvin | (noun) a kind of penicillin (a fungicidal antibiotic with the trade name Fulvicin) produced by molds of the genus Penicillium | Synonyms: Fulvicin |
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| haloform | (noun) compounds with the formula CHX3, where X is a halogen atom | - |
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| handoff | (noun) (American football) a play in which one player hands the ball to a teammate | - |
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| hayloft | (noun) a loft in a barn where hay is stored | Synonyms: haymow, mow |
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| hepatoflavin | (noun) a B vitamin that prevents skin lesions and weight loss | Synonyms: lactoflavin, ovoflavin, riboflavin, vitamin B2, vitamin G |
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| hereof | (adverb) of or concerning this | - |
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| heretofore | (adverb) used in negative statement to describe a situation that has existed up to this point or up to the present time | Synonyms: as yet, hitherto, so far, thus far, til now, until now, up to now, yet |
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| hoof | (noun) the foot of an ungulate mammal | - |
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| (noun) the horny covering of the end of the foot in ungulate mammals | - |
| (verb) dance in a professional capacity | - |
| (verb) walk | Synonyms: foot, hoof it, leg it |
| hoofed | (adjective) having or resembling hoofs | Synonyms: hooved, ungulate, ungulated |
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| hoofer | (noun) a professional dancer | Synonyms: stepper |
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| hoofing | (noun) dancing in which the steps are more important than gestures or postures | Synonyms: step dancing |
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| hooflike | (adjective) resembling a hoof; especially having the horny texture of a hoof | - |
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| hoofprint | (noun) a visible impression on a surface made by the hoof of an animal | Synonyms: hoof-mark, hoof mark |
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| hydrochlorofluorocarbon | (noun) a fluorocarbon that is replacing chlorofluorocarbon as a refrigerant and propellant in aerosol cans; considered to be somewhat less destructive to the atmosphere | Synonyms: HCFC |
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| hydroflumethiazide | (noun) diuretic used to treat hypertension and edema | - |
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| hydrofluorocarbon | (noun) a fluorocarbon emitted as a by-product of industrial manufacturing | Synonyms: HFC |
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| hydrofoil | (noun) a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds | Synonyms: hydroplane |
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| (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: foil |
| ibuprofen | (noun) a nonsteroidal anti-inflammatory and analgesic medicine (trade names Advil and Motrin and Nuprin) used to relieve the pain of arthritis and as an antipyretic | Synonyms: Advil, isobutylphenyl propionic acid, Motrin, Nuprin |
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| immunofluorescence | (noun) (immunology) a technique that uses antibodies linked to a fluorescent dye in order to study antigens in a sample of tissue | - |
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| inoffensive | (adjective) giving no offense | - |
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| (adjective) not causing anger or annoyance | Synonyms: unoffending |
| inoffensively | (adverb) in a not unpleasantly offensive manner | - |
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| insofar | (adverb) to the degree or extent that | Synonyms: in so far, so far, to that degree, to that extent |
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| iodoform | (noun) a yellowish crystalline solid with a penetrating odor; sometimes used as an antiseptic dressing | Synonyms: triiodomethane |
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| (noun) sweet smelling yellow solid haloform CHI3 | Synonyms: tri-iodomethane |
| isoflurane | (noun) a widely used inhalation anesthetic | - |
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| ketoprofen | (noun) nonsteroidal anti-inflammatory drug (trade names Orudis or Orudis KT or Oruvail) | Synonyms: Orudis, Orudis KT, Oruvail |
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| kickoff | (noun) (football) a kick from the center of the field to start a football game or to resume it after a score | - |
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| (noun) a start given to contestants | Synonyms: send-off, start-off |
| (noun) the time at which something is supposed to begin | Synonyms: beginning, commencement, first, get-go, offset, outset, showtime, start, starting time |
| kniphofia | (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, flameflower, tritoma |
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| knockoff | (noun) an unauthorized copy or imitation | Synonyms: clone |
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| lactoflavin | (noun) a B vitamin that prevents skin lesions and weight loss | Synonyms: hepatoflavin, ovoflavin, riboflavin, vitamin B2, vitamin G |
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| layoff | (noun) the act of laying off an employee or a work force | - |
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| leakproof | (adjective) not subject to leaks | - |
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| liftoff | (noun) the initial ascent of a rocket from its launching pad | - |
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| lightproof | (adjective) not penetrable by light | Synonyms: light-tight |
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