| 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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| ailing | (adjective) somewhat ill or prone to illness | Synonyms: indisposed, peaked, poorly, seedy, sickly, under the weather, unwell |
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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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| aline | (verb) place in a line or arrange so as to be parallel or straight | Synonyms: adjust, align, line up |
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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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| alkaline | (adjective) relating to or containing an alkali; having a pH greater than 7 | Synonyms: alkalic |
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| alkalinise | (verb) make (a substance) alkaline | Synonyms: alkalinize |
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| (verb) become alkaline | Synonyms: alkalinize |
| alkalinity | (noun) pH values above 7 | - |
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| alkalinize | (verb) make (a substance) alkaline | Synonyms: alkalinise |
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| (verb) become alkaline | Synonyms: alkalinise |
| 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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| amygdaline | (adjective) related to or resembling an almond | - |
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| anaclinal | (adjective) of valleys and rivers; progressing in a direction opposite to the dip in surrounding rock strata | - |
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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 | (adjective) relating to or characteristic of malaria mosquitoes | - |
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| (noun) any mosquito of the genus Anopheles | - |
| anticholinergic | (adjective) inhibiting or blocking the action of acetylcholine at a receptor site | - |
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| (noun) a substance that opposes or blocks the action of acetylcholine | Synonyms: anticholinergic drug |
| anticholinesterase | (noun) a medicine that inhibits cholinesterase by combining with it and so has a cholinergic effect | - |
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| anticlinal | (adjective) sloping downward away from a common crest | - |
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| appalling | (adjective) causing consternation | Synonyms: dismaying |
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| (noun) an experience that appalls | - |
| appallingly | (adverb) to an appalling extent | - |
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| appealing | (adjective) able to attract interest or draw favorable attention | - |
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| (adjective) (of characters in literature or drama) evoking empathic or sympathetic feelings | Synonyms: likable, likeable, sympathetic |
| appealingly | (adverb) in an appealing manner | - |
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| appealingness | (noun) attractiveness that interests or pleases or stimulates | Synonyms: appeal, charm |
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| aquiline | (adjective) curved down like an eagle's beak | Synonyms: hooked |
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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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| baffling | (adjective) making great mental demands; hard to comprehend or solve or believe | Synonyms: elusive, knotty, problematic, problematical, tough |
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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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| beetling | (adjective) jutting or overhanging | Synonyms: beetle |
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| befooling | (noun) derision of someone or something as foolish or absurd or inconsistent | Synonyms: stultification |
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| beguiling | (adjective) misleading by means of pleasant or alluring methods | - |
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| (adjective) highly attractive and able to arouse hope or desire | Synonyms: alluring, enticing, tempting |
| belittling | (adjective) tending to diminish or disparage | Synonyms: deprecating, deprecative, deprecatory, depreciative, depreciatory, slighting |
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| (noun) the act of belittling | - |
| (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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| bicylindrical | (adjective) having two cylindrical surfaces usually with parallel axes | - |
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| bilinear | (adjective) linear with respect to each of two variables or positions | - |
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| bilingual | (adjective) using or knowing two languages | - |
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| (noun) a person who speaks two languages fluently | Synonyms: bilingualist |
| 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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| bilingually | (adverb) in a bilingual manner | - |
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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 | (adjective) unable to see | Synonyms: unsighted |
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| (adjective) not based on reason or evidence | Synonyms: unreasoning |
| (adjective) unable or unwilling to perceive or understand | - |
| (noun) a protective covering that keeps things out or hinders sight | Synonyms: screen |
| (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 | - |
| (verb) make dim by comparison or conceal | Synonyms: dim |
| (verb) make blind by putting the eyes out | - |
| (verb) render unable to see | - |
| blinded | (adjective) deprived of sight | - |
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| 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 | (adjective) wearing a blindfold | Synonyms: blindfolded |
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| (noun) a cloth used to cover the eyes | - |
| (verb) cover the eyes of (someone) to prevent him from seeing | - |
| blindfolded | (adjective) wearing a blindfold | Synonyms: blindfold |
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| blinding | (adjective) shining intensely | Synonyms: blazing, dazzling, fulgent, glaring, glary |
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| blindly | (adverb) without seeing or looking | - |
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| (adverb) without preparation or reflection; without a rational basis | - |
| blindness | (noun) the state of being blind or lacking sight | Synonyms: cecity, sightlessness |
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| blindside | (verb) attack or hit on or from the side where the attacked person's view is obstructed | - |
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| (verb) catch unawares, especially with harmful consequences | - |
| 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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| (verb) briefly shut the eyes | Synonyms: nictate, nictitate, wink |
| (verb) keep back by blinking | Synonyms: blink away, wink |
| (verb) gleam or glow intermittently | Synonyms: flash, twinkle, wink, winkle |
| 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 |
| (verb) put blinders on (a horse) | - |
| blinking | (adjective) closing the eyes intermittently and rapidly | Synonyms: winking |
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| (adjective) informal intensifiers | Synonyms: bally, bloody, blooming, crashing, flaming, fucking |
| (noun) a reflex that closes and opens the eyes rapidly | Synonyms: blink, eye blink, nictation, nictitation, wink, winking |
| 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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| bloodcurdling | (adjective) extremely alarming | Synonyms: hair-raising, nightmarish |
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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 | - |
| (adverb) passionately or agitatedly | - |
| borderline | (adjective) of questionable or minimal quality | Synonyms: marginal |
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| (noun) a line that indicates a boundary | Synonyms: border, boundary line, delimitation, mete |
| 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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| botulinal | (adjective) of or relating to or produced by the botulinus | - |
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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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| bubaline | (adjective) relating to or resembling a buffalo | - |
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| bubbliness | (noun) the property of giving off bubbles | Synonyms: effervescence, frothiness |
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| bubbling | (adjective) emitting or filled with bubbles as from carbonation or fermentation | Synonyms: bubbly, effervescing, foaming, foamy, frothy, spumy |
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| (adjective) marked by high spirits or excitement | Synonyms: effervescent, frothy, scintillating, sparkly |
| bumbling | (adjective) lacking physical movement skills, especially with the hands | Synonyms: bungling, butterfingered, ham-fisted, ham-handed, handless, heavy-handed, left-handed |
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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 | - |