| aborigine | (noun) an indigenous person who was born in a particular place | Synonyms: aboriginal, indigen, indigene, native |
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| acarine | (noun) mite or tick | - |
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| accipitrine | (adjective) of or relating to or belonging to the genus Accipiter (or to typical hawks) | - |
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| 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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| adamantine | (adjective) consisting of or having the hardness of adamant | - |
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| (adjective) having the hardness of a diamond | - |
| (adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamant, inexorable, intransigent |
| adenine | (noun) (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA | Synonyms: A |
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| adenosine | (noun) (biochemistry) a nucleoside that is a structural component of nucleic acids; it is present in all living cells in a combined form as a constituent of DNA and RNA and ADP and ATP and AMP | - |
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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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| adulterine | (adjective) conceived in adultery | - |
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| aeromedicine | (noun) the study and treatment of disorders associated with flight (especially with space flight) | Synonyms: aerospace medicine, aviation medicine |
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| affine | (adjective) (mathematics) of or pertaining to the geometry of affine transformations | - |
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| (adjective) (anthropology) related by marriage | Synonyms: affinal |
| (noun) (anthropology) kin by marriage | - |
| 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 |
| alabastrine | (adjective) of or resembling alabaster | Synonyms: alabaster |
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| alanine | (noun) a crystalline amino acid that occurs in many proteins | - |
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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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| alizarine | (noun) an orange-red crystalline compound used in making red pigments and in dyeing | Synonyms: alizarin |
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| alkaline | (adjective) relating to or containing an alkali; having a pH greater than 7 | Synonyms: alkalic |
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| almandine | (noun) a purple variety of the ruby spinel | - |
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| (noun) a deep red garnet consisting of iron aluminum silicate | Synonyms: almandite |
| alpestrine | (adjective) growing at high altitudes | Synonyms: subalpine |
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| alpine | (adjective) relating to or characteristic of alps | - |
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| (adjective) living or growing above the timber line | - |
| alvine | (adjective) of or relating to the intestines | - |
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| amaranthine | (adjective) of or related to the amaranth plant | - |
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| (adjective) of an imaginary flower that never fades | Synonyms: unfading |
| amethystine | (adjective) containing or resembling amethyst | - |
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| amidopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: aminopyrine |
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| amine | (noun) a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals | Synonyms: aminoalkane |
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| aminobenzine | (noun) oily poisonous liquid amine obtained from nitrobenzene and used to make dyes and plastics and medicines | Synonyms: aniline, aniline oil, phenylamine |
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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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| aminopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: amidopyrine |
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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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| ammine | (noun) a complex inorganic compound that contains ammonia molecules | - |
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| amphetamine | (noun) a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression | Synonyms: pep pill, speed, upper |
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| amygdaline | (adjective) related to or resembling an almond | - |
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| anguine | (adjective) of or related to or resembling a snake | - |
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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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| anopheline | (adjective) relating to or characteristic of malaria mosquitoes | - |
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| (noun) any mosquito of the genus Anopheles | - |
| anserine | (adjective) of or resembling a goose | - |
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| (adjective) having or revealing stupidity | Synonyms: dopey, dopy, foolish, gooselike, goosey, goosy, jerky |
| antihistamine | (noun) a medicine used to treat allergies and hypersensitive reactions and colds; works by counteracting the effects of histamine on a receptor site | - |
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| antisubmarine | (adjective) defensive against enemy submarines | - |
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| apocrine | (adjective) (of exocrine glands) producing a secretion in which part of the secreting cell is released with the secretion | - |
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| apomorphine | (noun) a morphine derivative that is not as strong as morphine; used as an emetic and in small doses as a sedative | - |
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| aquamarine | (noun) a shade of blue tinged with green | Synonyms: aqua, cobalt blue, greenish blue, peacock blue, turquoise |
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| (noun) a transparent variety of beryl that is blue green in color | - |
| aquiline | (adjective) curved down like an eagle's beak | Synonyms: hooked |
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| arccosine | (noun) the inverse function of the cosine; the angle that has a cosine equal to a given number | Synonyms: arc cosine, arccos, inverse cosine |
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| archine | (noun) a Russian unit of length (71 cm) | - |
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| arcsine | (noun) the inverse function of the sine; the angle that has a sine equal to a given number | Synonyms: arc sine, arcsin, inverse sine |
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| argentine | (noun) any of various small silver-scaled salmon-like marine fishes | - |
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| arginine | (noun) a bitter tasting amino acid found in proteins and necessary for nutrition; its absence from the diet leads to a reduced production of spermatozoa | - |
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| arsine | (noun) a poisonous colorless flammable gas used in organic synthesis and to dope transistors and as a poison gas in warfare | - |
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| asinine | (adjective) extremely silly or stupid | Synonyms: fatuous, inane |
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| asparagine | (noun) a crystalline amino acid found in proteins and in many plants (e.g., asparagus) | - |
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| astatine | (noun) a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium | Synonyms: At, atomic number 85 |
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| atrazine | (noun) a synthetic compound derived from triazine that is widely used as an agricultural herbicide | - |
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| atropine | (noun) a poisonous crystalline alkaloid extracted from the nightshade family; used as an antispasmodic and to dilate the eye pupil; also administered in large amounts as an antidote for organophosphate nerve agents or organophosphate insecticides | - |
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| aubergine | (noun) egg-shaped vegetable having a shiny skin typically dark purple but occasionally white or yellow | Synonyms: eggplant, mad apple |
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| (noun) hairy upright herb native to southeastern Asia but widely cultivated for its large glossy edible fruit commonly used as a vegetable | Synonyms: brinjal, eggplant, eggplant bush, garden egg, mad apple, Solanum melongena |
| australopithecine | (adjective) of or belonging to the hominid genus Australopithecus | - |
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| (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
| aventurine | (noun) a translucent quartz spangled with bits of mica or other minerals | Synonyms: sunstone |
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| azathioprine | (noun) an immunosuppressive drug (trade name Imuran) used to prevent rejection of a transplanted organ | Synonyms: Imuran |
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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 | - |
| bassine | (noun) coarse leaf fiber from palmyra palms used in making brushes and brooms | - |
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| beeline | (noun) the most direct route | - |
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| beguine | (noun) a ballroom dance that originated in the French West Indies; similar to the rumba | - |
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| (noun) music written in the bolero rhythm of the beguine dance | - |
| bellarmine | (noun) a stoneware drinking jug with a long neck; decorated with a caricature of Cardinal Bellarmine (17th century) | Synonyms: greybeard, long-beard, longbeard |
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| benedictine | (noun) a French liqueur originally made by Benedictine monks | - |
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| benzine | (noun) a colorless liquid hydrocarbon; highly flammable; carcinogenic; the simplest of the aromatic compounds | Synonyms: benzene, benzol |
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| benzocaine | (noun) a white crystalline ester used as a local anesthetic | Synonyms: ethyl aminobenzoate |
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| benzodiazepine | (noun) any of several similar lipophilic amines used as tranquilizers or sedatives or hypnotics or muscle relaxants; chronic use can lead to dependency | - |
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| betaine | (noun) a sweet tasting alkaloid that occurs in sugar beets | - |
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| bine | (noun) European twining plant whose flowers are used chiefly to flavor malt liquors; cultivated in America | Synonyms: common hop, common hops, European hop, Humulus lupulus |
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| biomedicine | (noun) the branch of medical science that studies the ability of organisms to withstand environmental stress (as in space travel) | - |
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| (noun) the branch of medical science that applies biological and physiological principles to clinical practice | - |
| bisontine | (adjective) relating to or characteristic of bison | - |
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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 |
| bombazine | (noun) a twilled fabric used for dresses; the warp is silk and the weft is worsted | - |
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| 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 |
| bovine | (adjective) of or relating to or belonging to the genus Bos (cattle) | Synonyms: bovid |
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| (adjective) dull and slow-moving and stolid; like an ox | - |
| (noun) any of various members of the genus Bos | - |
| bowline | (noun) a loop knot that neither slips nor jams | Synonyms: bowline knot |
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| breadline | (noun) a queue of people waiting for free food | Synonyms: bread line |
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| brigandine | (noun) a medieval coat of chain mail consisting of metal rings sewn onto leather or cloth | - |
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| brigantine | (noun) two-masted sailing vessel square-rigged on the foremast and fore-and-aft rigged on the mainmast | Synonyms: hermaphrodite brig |
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| brilliantine | (noun) a pomade to make the hair manageable and lustrous | - |
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| brine | (noun) a strong solution of salt and water used for pickling | - |
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| (noun) water containing salts | Synonyms: saltwater, seawater |
| (verb) soak in brine | - |
| bromine | (noun) a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water | Synonyms: atomic number 35, Br |
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| brucine | (noun) a bitter alkaloid poison resembling strychnine and extracted from nux vomica | - |
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| bubaline | (adjective) relating to or resembling a buffalo | - |
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| butacaine | (noun) a white crystalline ester that is applied to mucous membranes as a local anesthetic | Synonyms: butacaine sulfate |
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| buteonine | (adjective) relating to or resembling a hawk of the genus Buteo | - |
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| (noun) any hawk of the genus Buteo | - |
| cadaverine | (noun) a colorless toxic ptomaine with an unpleasant odor formed during the putrefaction of animal tissue | - |
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| caffeine | (noun) a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects | Synonyms: caffein |
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| calamine | (noun) a white mineral; a common ore of zinc | Synonyms: hemimorphite |
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| calcimine | (noun) a water-base paint containing zinc oxide and glue and coloring; used as a wash for walls and ceilings | - |
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| (verb) cover with calcimine | - |
| calcine | (verb) heat a substance so that it oxidizes or reduces | - |
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| calycine | (adjective) of or relating to or resembling a calyx | Synonyms: calyceal, calycinal |
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| canavanine | (noun) an amino acid found in the jack bean | - |
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| canine | (adjective) of or relating to or characteristic of members of the family Canidae | - |
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| (adjective) of or relating to a pointed conical tooth | Synonyms: laniary |
| (noun) any of various fissiped mammals with nonretractile claws and typically long muzzles | Synonyms: canid |
| (noun) one of the four pointed conical teeth (two in each jaw) located between the incisors and the premolars | Synonyms: canine tooth, cuspid, dogtooth, eye tooth, eyetooth |
| caprine | (adjective) being or pertaining to or resembling a goat or goats | - |
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| carbine | (noun) light automatic rifle | - |
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| carmine | (adjective) of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies | Synonyms: blood-red, cerise, cherry-red, cherry, crimson, red, reddish, ruby-red, ruby, ruddy, scarlet |
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| (noun) a variable color averaging a vivid red | Synonyms: cardinal |
| (verb) color carmine | - |
| catarrhine | (adjective) of or related to Old World monkeys that have nostrils together and opening downward | Synonyms: catarrhinian |
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| (noun) of Africa or Arabia or Asia; having nonprehensile tails and nostrils close together | Synonyms: Old World monkey |
| catecholamine | (noun) any of a group of chemicals including epinephrine and norepinephrine that are produced in the medulla of the adrenal gland | - |
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| cauline | (adjective) especially of leaves; growing on a stem especially on the upper part of a stem | - |
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| (adjective) (of plants) producing a well-developed stem above ground | Synonyms: caulescent, stemmed |