| abstain | (verb) choose not to consume | Synonyms: desist, refrain |
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| (verb) refrain from voting | - |
| acetin | (noun) any of three liquid acetates that are formed when acetic acid and glycerin are heated together | - |
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| acetophenetidin | (noun) a white crystalline compound used as an analgesic and also as an antipyretic | Synonyms: acetphenetidin, phenacetin |
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| acetphenetidin | (noun) a white crystalline compound used as an analgesic and also as an antipyretic | Synonyms: acetophenetidin, phenacetin |
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| achromatin | (noun) the part of a cell nucleus that is relatively uncolored by stains or dyes | - |
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| acrolein | (noun) a pungent colorless unsaturated liquid aldehyde made from propene | Synonyms: propenal |
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| actin | (noun) one of the proteins into which actomyosin can be split; can exist in either a globular or a fibrous form | - |
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| actinomycin | (noun) any of various red antibiotics isolated from soil bacteria | - |
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| actomyosin | (noun) a protein complex in muscle fibers; composed of myosin and actin; shortens when stimulated and causes muscle contractions | - |
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| adermin | (noun) a B vitamin that is essential for metabolism of amino acids and starch | Synonyms: pyridoxal, pyridoxamine, pyridoxine, vitamin B6 |
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| adjoin | (verb) attach or add | - |
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| (verb) lie adjacent to another or share a boundary | Synonyms: abut, border, butt, butt against, butt on, edge, march |
| (verb) be in direct physical contact with; make contact | Synonyms: contact, meet, touch |
| adrenocorticotrophin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotropic hormone, adrenocorticotropin, corticotrophin, corticotropin |
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| adrenocorticotropin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, corticotrophin, corticotropin |
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| aflatoxin | (noun) a potent carcinogen from the fungus Aspergillus; can be produced and stored for use as a bioweapon | - |
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| again | (adverb) anew | Synonyms: once again, once more, over again |
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| agglutinin | (noun) an antibody that causes agglutination of a specific antigen | - |
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| ain | (adjective) belonging to or on behalf of a specified person (especially yourself); preceded by a possessive | Synonyms: own |
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| akin | (adjective) related by blood | Synonyms: blood-related, cognate, consanguine, consanguineal, consanguineous, kin |
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| (adjective) similar in quality or character | Synonyms: kindred |
| albumin | (noun) a simple water-soluble protein found in many animal tissues and liquids | Synonyms: albumen |
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| algin | (noun) a gum used especially as a thickener or emulsifier | Synonyms: alginic acid |
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| alizarin | (noun) an orange-red crystalline compound used in making red pigments and in dyeing | Synonyms: alizarine |
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| altcoin | (noun) an alternative cryptocurrency | - |
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| amain | (adverb) with all your strength | - |
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| (adverb) at full speed; with great haste | - |
| amethopterin | (noun) toxic antimetabolite that limits cellular reproduction by acting as an antagonist to folic acid; used to treat certain cancers and psoriasis and rheumatoid arthritis | Synonyms: methotrexate, methotrexate sodium |
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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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| amphotericin | (noun) an antibiotic and antifungal agent | - |
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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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| anatoxin | (noun) a bacterial toxin that has been weakened until it is no longer toxic but is strong enough to induce the formation of antibodies and immunity to the specific disease caused by the toxin | Synonyms: toxoid |
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| andelmin | (noun) any of several tropical American trees of the genus Andira | Synonyms: angelim |
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| aneurin | (noun) a B vitamin that prevents beriberi; maintains appetite and growth | Synonyms: antiberiberi factor, thiamin, thiamine, vitamin B1 |
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| angiotensin | (noun) any of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vessels | Synonyms: angiotonin, Hypertensin |
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| angiotonin | (noun) any of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vessels | Synonyms: angiotensin, Hypertensin |
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| antifertilizin | (noun) An immunologically specific substance produced by animal sperm to implement attraction by the egg before fertilization. | - |
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| antimycin | (noun) a crystalline antibiotic active against various fungi | - |
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| antitoxin | (noun) an antibody that can neutralize a specific toxin | - |
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| antivenin | (noun) an antitoxin that counteracts the effects of venom from the bite of a snake or insect or other animal | Synonyms: antivenene |
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| appertain | (verb) be a part or attribute of | Synonyms: pertain |
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| arcsin | (noun) the inverse function of the sine; the angle that has a sine equal to a given number | Synonyms: arc sine, arcsine, inverse sine |
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| ascertain | (verb) be careful or certain to do something; make certain of something | Synonyms: assure, check, control, ensure, insure, see, see to it |
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| (verb) learn or discover with certainty | - |
| (verb) find out, learn, or determine with certainty, usually by making an inquiry or other effort | Synonyms: check, determine, find out, learn, see, watch |
| (verb) establish after a calculation, investigation, experiment, survey, or study | Synonyms: determine, find, find out |
| ashbin | (noun) a bin that holds rubbish until it is collected | Synonyms: ash-bin, ash bin, ashcan, dustbin, garbage can, trash barrel, trash bin, trash can, wastebin |
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| aspirin | (noun) the acetylated derivative of salicylic acid; used as an analgesic anti-inflammatory drug (trade names Bayer, Empirin, and St. Joseph) usually taken in tablet form; used as an antipyretic; slows clotting of the blood by poisoning platelets | Synonyms: acetylsalicylic acid, Bayer, Empirin, St. Joseph |
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| assassin | (noun) a murderer (especially one who kills a prominent political figure) who kills by a surprise attack and often is hired to do the deed | Synonyms: assassinator, bravo |
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| (noun) a member of a secret order of Muslims (founded in the 12th century) who terrorized and killed Christian Crusaders | - |
| atorvastatin | (noun) an oral drug (trade name Lipitor) that is effective in lowering triglycerides; potent in reducing LDL cholesterol because higher doses can be given | Synonyms: Lipitor |
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| attain | (verb) reach a point in time, or a certain state or level | Synonyms: hit, reach |
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| (verb) reach a destination, either real or abstract | Synonyms: arrive at, gain, hit, make, reach |
| (verb) find unexpectedly | Synonyms: chance on, chance upon, come across, come upon, discover, fall upon, happen upon, light upon, strike |
| (verb) to gain with effort | Synonyms: accomplish, achieve, reach |
| auxin | (noun) a plant hormone that promotes root formation and bud growth | - |
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| ayin | (noun) the 16th letter of the Hebrew alphabet | - |
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| azadirachtin | (noun) insecticide | - |
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| azithromycin | (noun) a systemic antibacterial medicine (trade name Zithromax) that is prescribed to treat bacterial infections in many different parts of the body | Synonyms: Zithromax |
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| bacitracin | (noun) a polypeptide antibiotic of known chemical structure effective against several types of Gram-positive organisms; usually applied locally | - |
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| backspin | (noun) spin (usually of a moving ball) that retards or reverses the forward motion | - |
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| baldachin | (noun) ornamented canopy supported by columns or suspended from a roof or projected from a wall (as over an altar) | - |
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| bargain | (noun) an agreement between parties (usually arrived at after discussion) fixing obligations of each | Synonyms: deal |
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| (noun) an advantageous purchase | Synonyms: buy, steal |
| (verb) come to terms; arrive at an agreement | - |
| (verb) negotiate the terms of an exchange | Synonyms: dicker |
| basin | (noun) a bowl-shaped vessel; usually used for holding food or liquids | - |
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| (noun) a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face | Synonyms: lavatory, washbasin, washbowl, washstand |
| (noun) the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet | Synonyms: catchment area, catchment basin, drainage area, drainage basin, river basin, watershed |
| (noun) a natural depression in the surface of the land often with a lake at the bottom of it | - |
| (noun) the quantity that a basin will hold | Synonyms: basinful |
| bearskin | (noun) tall hat; worn by some British soldiers on ceremonial occasions | Synonyms: busby, shako |
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| (noun) the pelt of a bear | - |
| begin | (verb) take the first step or steps in carrying out an action | Synonyms: commence, get, get down, set about, set out, start, start out |
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| (verb) set in motion, cause to start | Synonyms: commence, lead off, start |
| (verb) begin to speak or say | - |
| (verb) begin to speak, understand, read, and write a language | - |
| (verb) achieve or accomplish in the least degree, usually used in the negative | - |
| (verb) begin an event that is implied and limited by the nature or inherent function of the direct object | Synonyms: start |
| (verb) have a beginning, in a temporal, spatial, or evaluative sense | Synonyms: start |
| (verb) be the first item or point, constitute the beginning or start, come first in a series | - |
| (verb) have a beginning characterized in some specified way | Synonyms: start |
| (verb) have a beginning, of a temporal event | - |
| benjamin | (noun) gum resin used especially in treating skin irritation | Synonyms: asa dulcis, benzoin, gum benjamin, gum benzoin |
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| benzoin | (noun) gum resin used especially in treating skin irritation | Synonyms: asa dulcis, benjamin, gum benjamin, gum benzoin |
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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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| betweenbrain | (noun) the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon | Synonyms: diencephalon, interbrain, thalmencephalon |
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| biggin | (noun) a child's tight-fitting cap; often ties under the chin | - |
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| bilirubin | (noun) an orange-yellow pigment in the bile that forms as a product of hemoglobin; excess amounts in the blood produce the yellow appearance observed in jaundice | Synonyms: haematoidin, hematoidin |
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| bin | (noun) a container; usually has a lid | - |
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| (noun) the quantity contained in a bin | Synonyms: binful |
| (verb) store in bins | - |
| biotin | (noun) a B vitamin that aids in body growth | Synonyms: vitamin H |
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| birdbrain | (noun) a person with confused ideas; incapable of serious thought | Synonyms: addle-head, addlehead, loon |
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| blain | (noun) an inflammatory swelling or sore | - |
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| bloodstain | (noun) a discoloration caused by blood | - |
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| bluefin | (noun) largest tuna; to 1500 pounds; of mostly temperate seas: feed in polar regions but breed in tropics | Synonyms: bluefin tuna, horse mackerel, Thunnus thynnus |
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| (noun) flesh of very large tuna | Synonyms: bluefin tuna |
| boatswain | (noun) a petty officer on a merchant ship who controls the work of other seamen | Synonyms: bo's'n, bo'sun, bos'n, bosun |
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| bobbin | (noun) a winder around which thread or tape or film or other flexible materials can be wound | Synonyms: reel, spool |
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| bodkin | (noun) a blunt needle for threading ribbon through loops | Synonyms: threader |
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| (noun) a small sharp-pointed tool for punching holes in leather or fabric | - |
| (noun) formerly a long hairpin; usually with an ornamental head | - |
| (noun) a dagger with a slender blade | Synonyms: poniard |
| boffin | (noun) (British slang) a scientist or technician engaged in military research | - |
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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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| botulismotoxin | (noun) potent bacterial toxin produced by the bacterium Clostridium botulinum that causes botulism; can be used as a bioweapon | Synonyms: botulin, botulinus toxin |
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| bowfin | (noun) primitive long-bodied carnivorous freshwater fish with a very long dorsal fin; found in sluggish waters of North America | Synonyms: Amia calva, dogfish, grindle |
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| brahmin | (noun) the highest of the four varnas: the priestly or sacerdotal category | Synonyms: brahman |
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| (noun) a member of the highest of the four Hindu varnas | Synonyms: brahman |
| (noun) a member of a social and cultural elite (especially a descendant of an old New England family) | Synonyms: brahman |
| brain | (noun) that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord | Synonyms: encephalon |
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| (noun) mental ability | Synonyms: brainpower, learning ability, mental capacity, mentality, wit |
| (noun) that which is responsible for one's thoughts, feelings, and conscious brain functions; the seat of the faculty of reason | Synonyms: head, mind, nous, psyche |
| (noun) the brain of certain animals used as meat | - |
| (noun) someone who has exceptional intellectual ability and originality | Synonyms: brainiac, Einstein, genius, mastermind |
| (verb) hit on the head | - |
| (verb) kill by smashing someone's skull | - |
| breastpin | (noun) a decorative pin worn by women | Synonyms: broach, brooch |
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| bromeosin | (noun) a red fluorescent dye resulting from the action of bromine on fluorescein; used in cosmetics and as a biological stain for studying cell structures | Synonyms: eosin |
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| bruin | (noun) large ferocious bear of Eurasia | Synonyms: brown bear, Ursus arctos |
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| (noun) a conventional name for a bear used in tales following usage in the old epic `Reynard the Fox' | - |
| buckskin | (noun) horse of a light yellowish dun color with dark mane and tail | - |
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| (noun) a soft yellowish suede leather originally from deerskin but now usually from sheepskin | - |
| bulletin | (noun) a brief report (especially an official statement issued for immediate publication or broadcast) | - |
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| (verb) make public by bulletin | - |
| bumpkin | (noun) a person who is not very intelligent or interested in culture | Synonyms: chawbacon, hayseed, hick, rube, yahoo, yokel |
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| burin | (noun) a chisel of tempered steel with a sharp point; used for engraving | - |
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| buskin | (noun) a boot reaching halfway up to the knee | Synonyms: combat boot, desert boot, half boot, top boot |
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| butyrin | (noun) any of three glycerides of butyric acid | - |
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| cabin | (noun) the enclosed compartment of an aircraft or spacecraft where passengers are carried | - |
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| (noun) small room on a ship or boat where people sleep | - |
| (noun) a small house built of wood; usually in a wooded area | - |
| (verb) confine to a small space, such as a cabin | - |
| caffein | (noun) a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects | Synonyms: caffeine |
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| calamondin | (noun) a fruit of the calamondin tree. | - |
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| calcitonin | (noun) thyroid hormone that tends to lower the level of calcium in the blood plasma and inhibit resorption of bone | Synonyms: thyrocalcitonin |
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| calfskin | (noun) fine leather from the skin of a calf | Synonyms: calf |
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| calkin | (noun) a metal cleat on the bottom front of a horseshoe to prevent slipping | Synonyms: calk |
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| candlepin | (noun) a bowling pin that is thin by comparison with a tenpin | - |
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| cannabin | (noun) a resin obtained from the hemp plant; thought to be the active narcotic agent in marijuana | Synonyms: cannabis resin |
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| cannikin | (noun) a small can | - |
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| (noun) a wooden bucket | - |
| 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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| capsaicin | (noun) colorless pungent crystalline compound derived from capsicum; source of the hotness of hot peppers of the genus Capsicum such as chili and cayenne and jalapeno | - |
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| captain | (noun) a dining-room attendant who is in charge of the waiters and the seating of customers | Synonyms: headwaiter, maitre d', maitre d'hotel |
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| (noun) the pilot in charge of an airship | Synonyms: senior pilot |
| (noun) the naval officer in command of a military ship | Synonyms: skipper |
| (noun) an officer who is licensed to command a merchant ship | Synonyms: master, sea captain, skipper |
| (noun) a policeman in charge of a precinct | Synonyms: police captain, police chief |
| (noun) an officer holding a rank below a major but above a lieutenant | - |
| (noun) the leader of a group of people | Synonyms: chieftain |
| (verb) be the captain of a sports team | - |