| acetylcholine | (noun) a neurotransmitter that is a derivative of choline; released at the ends of nerve fibers in the somatic and parasympathetic nervous systems | - |
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| adrenaline | (noun) a catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action | Synonyms: Adrenalin, epinephrin, epinephrine |
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| agammaglobulinemia | (noun) a rare immunological disorder characterized by the virtual absence of gamma globulin in the blood and consequent susceptibility to infection | - |
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| airline | (noun) a commercial enterprise that provides scheduled flights for passengers | Synonyms: airline business, airway |
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| (noun) a hose that carries air under pressure | Synonyms: air hose |
| airliner | (noun) a commercial airplane that carries passengers | - |
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| alinement | (noun) an organization of people (or countries) involved in a pact or treaty | Synonyms: alignment, alliance, coalition |
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| alkalinity | (noun) pH values above 7 | - |
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| alkalinuria | (noun) a condition in which the urine (which is normally slightly acidic) is alkaline | Synonyms: alkaluria |
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| aminophylline | (noun) a theophylline derivative that is used as a bronchodilator in the treatment of bronchial asthma, emphysema, and bronchitis | - |
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| amitriptyline | (noun) a tricyclic antidepressant drug (trade name Elavil) with serious side effects; interacts with many other medications | Synonyms: amitriptyline hydrochloride, Elavil |
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| amoxicillin | (noun) an antibiotic; a semisynthetic oral penicillin (trade names Amoxil and Larotid and Polymox and Trimox and Augmentin) used to treat bacterial infections | Synonyms: Amoxil, Augmentin, Larotid, Polymox, Trimox |
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| ampicillin | (noun) semisynthetic penicillin (trade names Principen and Polycillin and SK-Ampicillin) | Synonyms: Polycillin, Principen, SK-Ampicillin |
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| amygdalin | (noun) a bitter cyanogenic glucoside extracted from the seeds of apricots and plums and bitter almonds | - |
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| anemoclinometer | (noun) A type of instrument which measures the inclination of the wind to the horizontal plane. | - |
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| angling | (noun) fishing with a hook and line (and usually a pole) | - |
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| aniline | (noun) oily poisonous liquid amine obtained from nitrobenzene and used to make dyes and plastics and medicines | Synonyms: aminobenzine, aniline oil, phenylamine |
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| annealing | (noun) hardening something by heat treatment | Synonyms: tempering |
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| anopheline | (noun) any mosquito of the genus Anopheles | - |
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| anticholinergic | (noun) a substance that opposes or blocks the action of acetylcholine | Synonyms: anticholinergic drug |
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| anticholinesterase | (noun) a medicine that inhibits cholinesterase by combining with it and so has a cholinergic effect | - |
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| appalling | (noun) an experience that appalls | - |
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| appealingness | (noun) attractiveness that interests or pleases or stimulates | Synonyms: appeal, charm |
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| assembling | (noun) the act of gathering something together | Synonyms: aggregation, collecting, collection |
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| babbling | (noun) gibberish resembling the sounds of a baby | Synonyms: babble, lallation |
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| balkline | (noun) line across a billiard table behind which the cue balls are placed at the start of a game | Synonyms: baulk-line, string line |
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| baseline | (noun) the lines a baseball player must follow while running the bases | - |
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| (noun) the back line bounding each end of a tennis or handball court; when serving the server must not step over this line | Synonyms: service line |
| (noun) an imaginary line or standard by which things are measured or compared | - |
| bawling | (noun) loud cries made while weeping | Synonyms: wailing |
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| beagling | (noun) hunting rabbits with beagles | - |
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| beastliness | (noun) unpleasant nastiness; used especially of nasty weather | - |
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| (noun) the quality of being deliberately mean | Synonyms: meanness |
| beeline | (noun) the most direct route | - |
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| befooling | (noun) derision of someone or something as foolish or absurd or inconsistent | Synonyms: stultification |
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| belittling | (noun) the act of belittling | - |
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| (noun) a belittling comment | Synonyms: denigration |
| belling | (noun) a noisy mock serenade (made by banging pans and kettles) to a newly married couple | Synonyms: callathump, callithump, charivari, chivaree, shivaree |
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| benzylpenicillin | (noun) the penicillin that constitutes the principal component of many commercial antibiotics | Synonyms: penicillin G |
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| berlin | (noun) a limousine with a glass partition between the front and back seats | - |
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| bicycling | (noun) riding a bicycle | - |
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| bilingual | (noun) a person who speaks two languages fluently | Synonyms: bilingualist |
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| bilingualism | (noun) the ability to speak two languages colloquially | - |
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| bilingualist | (noun) a person who speaks two languages fluently | Synonyms: bilingual |
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| billing | (noun) request for payment of a debt | Synonyms: charge |
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| billingsgate | (noun) foul-mouthed or obscene abuse | Synonyms: scurrility |
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| birling | (noun) rotating a log rapidly in the water (as a competitive sport) | Synonyms: logrolling |
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| blind | (noun) a protective covering that keeps things out or hinders sight | Synonyms: screen |
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| (noun) a hiding place sometimes used by hunters (especially duck hunters) | - |
| (noun) something intended to misrepresent the true nature of an activity | Synonyms: subterfuge |
| (noun) people who have severe visual impairments, considered as a group | - |
| blinder | (noun) blind consisting of a leather eyepatch sewn to the side of the halter that prevents a horse from seeing something on either side | Synonyms: blinker, winker |
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| blindfold | (noun) a cloth used to cover the eyes | - |
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| blindness | (noun) the state of being blind or lacking sight | Synonyms: cecity, sightlessness |
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| blindworm | (noun) small burrowing legless European lizard with tiny eyes; popularly believed to be blind | Synonyms: Anguis fragilis, slowworm |
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| (noun) any of the small slender limbless burrowing wormlike amphibians of the order Gymnophiona; inhabit moist soil in tropical regions | Synonyms: caecilian |
| bling | (noun) flashy, ostentatious jewelry | Synonyms: bling bling |
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| blini | (noun) Russian pancake of buckwheat flour and yeast; usually served with caviar and sour cream | Synonyms: bliny |
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| blink | (noun) a reflex that closes and opens the eyes rapidly | Synonyms: blinking, eye blink, nictation, nictitation, wink, winking |
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| blinker | (noun) a light that flashes on and off; used as a signal or to send messages | Synonyms: flasher |
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| (noun) blind consisting of a leather eyepatch sewn to the side of the halter that prevents a horse from seeing something on either side | Synonyms: blinder, winker |
| (noun) a blinking light on a motor vehicle that indicates the direction in which the vehicle is about to turn | Synonyms: trafficator, turn indicator, turn signal |
| blinking | (noun) a reflex that closes and opens the eyes rapidly | Synonyms: blink, eye blink, nictation, nictitation, wink, winking |
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| blinks | (noun) small Indian lettuce of northern regions | Synonyms: blinking chickweed, Montia lamprosperma, water chickweed |
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| blintz | (noun) (Judaism) thin pancake folded around a filling and fried or baked | Synonyms: blintze |
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| blintze | (noun) (Judaism) thin pancake folded around a filling and fried or baked | Synonyms: blintz |
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| bliny | (noun) Russian pancake of buckwheat flour and yeast; usually served with caviar and sour cream | Synonyms: blini |
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| bloodline | (noun) ancestry of a purebred animal | Synonyms: pedigree |
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| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood, blood line, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| bobolink | (noun) migratory American songbird | Synonyms: Dolichonyx oryzivorus, reedbird, ricebird |
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| boiling | (noun) cooking in a liquid that has been brought to a boil | Synonyms: simmering, stewing |
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| (noun) the application of heat to change something from a liquid to a gas | - |
| borderline | (noun) a line that indicates a boundary | Synonyms: border, boundary line, delimitation, mete |
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| botulin | (noun) potent bacterial toxin produced by the bacterium Clostridium botulinum that causes botulism; can be used as a bioweapon | Synonyms: botulinus toxin, botulismotoxin |
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| botulinum | (noun) anaerobic bacterium producing botulin the toxin that causes botulism | Synonyms: botulinus, Clostridium botulinum |
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| botulinus | (noun) anaerobic bacterium producing botulin the toxin that causes botulism | Synonyms: botulinum, Clostridium botulinum |
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| bowline | (noun) a loop knot that neither slips nor jams | Synonyms: bowline knot |
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| bowling | (noun) a game in which balls are rolled at an object or group of objects with the aim of knocking them over or moving them | - |
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| (noun) the playing of a game of tenpins or duckpins etc | - |
| (noun) (cricket) the act of delivering a cricket ball to the batsman | - |
| brambling | (noun) Eurasian finch | Synonyms: Fringilla montifringilla |
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| breadline | (noun) a queue of people waiting for free food | Synonyms: bread line |
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| brisling | (noun) small herring processed like a sardine | Synonyms: Clupea sprattus, sprat |
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| (noun) small fatty European fish; usually smoked or canned like sardines | Synonyms: sprat |
| bristliness | (noun) the quality of being covered with prickly thorns or spines | Synonyms: prickliness, spininess, thorniness |
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| broiling | (noun) cooking by direct exposure to radiant heat (as over a fire or under a grill) | Synonyms: broil, grilling |
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| bubbliness | (noun) the property of giving off bubbles | Synonyms: effervescence, frothiness |
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| bundling | (noun) the act of binding something into a bundle | - |
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| (noun) the act of shoving hastily | - |
| (noun) a onetime custom during courtship of unmarried couples occupying the same bed without undressing | - |
| calling | (noun) the particular occupation for which you are trained | Synonyms: career, vocation |
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| capelin | (noun) very small northern fish; forage for sea birds and marine mammals and other fishes | Synonyms: capelan, caplin |
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| caplin | (noun) very small northern fish; forage for sea birds and marine mammals and other fishes | Synonyms: capelan, capelin |
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| capulin | (noun) Mexican black cherry | Synonyms: Mexican black cherry |
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| (noun) Mexican black cherry tree having edible fruit | Synonyms: capulin tree, Prunus capuli |
| caroling | (noun) singing joyful religious songs (especially at Christmas) | - |
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| castling | (noun) interchanging the positions of the king and a rook | Synonyms: castle |
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| catling | (noun) a long double-edged knife used for amputations | - |
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| ceiling | (noun) the overhead upper surface of a covered space | - |
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| (noun) (meteorology) altitude of the lowest layer of clouds | - |
| (noun) maximum altitude at which a plane can fly (under specified conditions) | - |
| (noun) an upper limit on what is allowed | Synonyms: cap, roof |
| centerline | (noun) a line that bisects a plane figure | Synonyms: center line |
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| changeling | (noun) a child secretly exchanged for another in infancy | - |
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| (noun) a person of subnormal intelligence | Synonyms: cretin, half-wit, idiot, imbecile, moron, retard |
| chilliness | (noun) the property of being moderately cold | Synonyms: coolness, nip |
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| (noun) a lack of affection or enthusiasm | Synonyms: coldness, coolness, frigidity, frigidness, iciness |
| chilling | (noun) the process of becoming cooler; a falling temperature | Synonyms: cooling, temperature reduction |
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| chitlings | (noun) small intestines of hogs prepared as food | Synonyms: chitlins, chitterlings |
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| chitlins | (noun) small intestines of hogs prepared as food | Synonyms: chitlings, chitterlings |
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| chitterlings | (noun) small intestines of hogs prepared as food | Synonyms: chitlings, chitlins |
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| chlortetracycline | (noun) a yellow crystalline antibiotic (trade name Aureomycin) used to treat certain bacterial and rickettsial diseases | Synonyms: Aureomycin |
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| choline | (noun) a B-complex vitamin that is a constituent of lecithin; essential in the metabolism of fat | - |
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| cholinesterase | (noun) an enzyme that hydrolyses acetylcholine (into choline and acetic acid) | - |
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| citrulline | (noun) an amino acid that does not occur in proteins but is an intermediate in the conversion of ornithine to arginine | - |
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| cleanliness | (noun) diligence in keeping clean | - |
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| (noun) the habit of keeping free of superficial imperfections | - |
| clinch | (noun) (boxing) the act of one boxer holding onto the other to avoid being hit and to rest momentarily | - |
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| (noun) a tight or amorous embrace | Synonyms: hug, squeeze |
| (noun) the flattened part of a nail or bolt or rivet | - |
| (noun) a small slip noose made with seizing | Synonyms: clench |
| (noun) a device (generally used by carpenters) that holds things firmly together | Synonyms: clamp |
| clincher | (noun) a tool used to clinch nails or bolts or rivets | - |
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| (noun) a point or fact or remark that settles something conclusively | Synonyms: decisive factor |
| (noun) an argument that is conclusive | Synonyms: determiner, determining factor |
| cling | (noun) fruit (especially peach) whose flesh adheres strongly to the pit | Synonyms: clingstone |
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| clingfilm | (noun) a thin plastic film made of saran (trade name Saran Wrap) that sticks to itself; used for wrapping food | Synonyms: cling film, Saran Wrap |
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| clingfish | (noun) very small (to 3 inches) flattened marine fish with a sucking disc on the abdomen for clinging to rocks etc. | - |
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| clingstone | (noun) fruit (especially peach) whose flesh adheres strongly to the pit | Synonyms: cling |
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| clinic | (noun) a healthcare facility for outpatient care | - |
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| (noun) meeting for diagnosis of problems and instruction or remedial work in a particular activity | - |
| (noun) a medical establishment run by a group of medical specialists | - |
| clinician | (noun) a practitioner (of medicine or psychology) who does clinical work instead of laboratory experiments | - |
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