| anesthetize | (verb) administer an anesthetic drug to | Synonyms: anaesthetise, anaesthetize, anesthetise, put out, put under |
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| anesthyl | (noun) a mixture of methyl and ethyl chloride; sprayed on as a local anesthetic | - |
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| anestric | (adjective) of or relating to anestrus | Synonyms: anestrous, anoestrous |
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| anestrous | (adjective) (of lower mammals) not in a state of estrus; not in heat | - |
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| (adjective) of or relating to anestrus | Synonyms: anestric, anoestrous |
| anestrum | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrus, anoestrum, anoestrus |
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| anestrus | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anoestrum, anoestrus |
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| anethole | (noun) an organic compound that is widely used as a flavoring substance. | Synonyms: anise camphor |
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| aneuploid | (adjective) having a chromosome number that is not an exact multiple of the haploid number | - |
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| aneuploidy | (noun) an abnormality involving a chromosome number that is not an exact multiple of the haploid number (one chromosome set is incomplete) | - |
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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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| aneurism | (noun) a cardiovascular disease characterized by a saclike widening of an artery resulting from weakening of the artery wall | Synonyms: aneurysm |
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| aneurismal | (adjective) relating to or affected by an aneurysm | Synonyms: aneurismatic, aneurysmal, aneurysmatic |
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| aneurismatic | (adjective) relating to or affected by an aneurysm | Synonyms: aneurismal, aneurysmal, aneurysmatic |
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| aneurysm | (noun) a cardiovascular disease characterized by a saclike widening of an artery resulting from weakening of the artery wall | Synonyms: aneurism |
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| aneurysmal | (adjective) relating to or affected by an aneurysm | Synonyms: aneurismal, aneurismatic, aneurysmatic |
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| aneurysmatic | (adjective) relating to or affected by an aneurysm | Synonyms: aneurismal, aneurismatic, aneurysmal |
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| anew | (adverb) again but in a new or different way | Synonyms: afresh |
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| angiogenesis | (noun) the formation of new blood vessels | - |
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| angriness | (noun) the state of being angry | Synonyms: anger |
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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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| animateness | (noun) the property of being animated; having animal life as distinguished from plant life | Synonyms: aliveness, liveness |
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| anklebone | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: astragal, astragalus, talus |
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| anneal | (verb) bring to a desired consistency, texture, or hardness by a process of gradually heating and cooling | Synonyms: normalize, temper |
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| annealing | (noun) hardening something by heat treatment | Synonyms: tempering |
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| annelid | (adjective) relating to or belonging to or characteristic of any worms of the phylum Annelida | Synonyms: annelidan |
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| (noun) worms with cylindrical bodies segmented both internally and externally | Synonyms: annelid worm, segmented worm |
| annelidan | (adjective) relating to or belonging to or characteristic of any worms of the phylum Annelida | Synonyms: annelid |
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| annex | (noun) an addition that extends a main building | Synonyms: annexe, extension, wing |
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| (verb) add an extra part to | - |
| (verb) take (territory) as if by conquest | - |
| annexa | (noun) accessory or adjoining anatomical parts or appendages to an organ (especially of the embryo) | Synonyms: adnexa |
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| annexal | (adjective) of or pertaining to adnexa | Synonyms: adnexal |
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| annexation | (noun) the formal act of acquiring something (especially territory) by conquest or occupation | - |
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| (noun) incorporation by joining or uniting | Synonyms: appropriation |
| annexational | (adjective) relating to annexation | - |
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| annexe | (noun) an addition that extends a main building | Synonyms: annex, extension, wing |
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| anodyne | (adjective) capable of relieving pain | Synonyms: analgesic, analgetic |
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| (noun) a medicine used to relieve pain | Synonyms: analgesic, pain pill, painkiller |
| anomalousness | (noun) deviation from the normal or common order or form or rule | Synonyms: anomaly |
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| anoperineal | (adjective) relating to the anus and surrounding perineum | - |
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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 |
| answerableness | (noun) responsibility to someone or for some activity | Synonyms: accountability, answerability |
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| anthropogenesis | (noun) the evolution or genesis of the human race | Synonyms: anthropogeny |
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| anthropogenetic | (adjective) of or relating to the study of the origins and development of human beings | Synonyms: anthropogenic |
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| antiadrenergic | (adjective) relating to blocking or reducing adrenergic effects in the body | - |
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| 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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| anticyclone | (noun) (meteorology) winds spiraling outward from a high pressure center; circling clockwise in the Northern Hemisphere and counterclockwise in the southern | - |
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| antiferromagnet | (noun) any material that has antiferromagnetic properties. | - |
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| antiferromagnetic | (adjective) relating to antiferromagnetism | - |
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| antiferromagnetism | (noun) magnetic field creates parallel but opposing spins; varies with temperature | - |
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| 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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| antimagnetic | (adjective) impervious to the effects of a magnetic field; resistant to magnetization | - |
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| antineoplastic | (adjective) used in the treatment of cancer | Synonyms: anticancer, antitumor, antitumour |
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| (noun) any of several drugs that control or kill neoplastic cells; used in chemotherapy to kill cancer cells; all have unpleasant side effects that may include nausea and vomiting and hair loss and suppression of bone marrow function | Synonyms: antineoplastic drug, cancer drug |
| antineutrino | (noun) the antiparticle of a neutrino | - |
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| antineutron | (noun) the antiparticle of a neutron | - |
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| antipersonnel | (adjective) designed to inflict death or personal injury rather than material destruction | - |
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| antiquatedness | (noun) The state or quality of being outmoded or discredited by reason of age, of being out of style or fashion. | - |
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| antiqueness | (noun) the quality or state of being in the style or fashion of former times. | - |
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| antireligiousness | (noun) The state or condition of being opposed to religion. | - |
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| antisubmarine | (adjective) defensive against enemy submarines | - |
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| antivenene | (noun) an antitoxin that counteracts the effects of venom from the bite of a snake or insect or other animal | Synonyms: antivenin |
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| anxiousness | (noun) a feeling of mild anxiety about possible developments | Synonyms: disquiet |
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| (noun) (psychiatry) a relatively permanent state of worry and nervousness occurring in a variety of mental disorders, usually accompanied by compulsive behavior or attacks of panic | Synonyms: anxiety |
| apnea | (noun) transient cessation of respiration | - |
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| apneic | (adjective) of or relating to apnea | Synonyms: apnoeic |
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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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| apocryphalness | (noun) The property of being of doubtful authenticity, of lacking authority, or of not being regarded as canonical. | - |
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| (noun) The property of being of dubious veracity; of questionable accuracy or truthfulness. | - |
| apolune | (noun) apoapsis in orbit around the moon | Synonyms: aposelene |
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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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| aponeurosis | (noun) any of the deeper and thicker fascia that attach muscles to bones; resemble flattened tendons | - |
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| aponeurotic | (adjective) of or relating to an aponeurosis | - |
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| aposelene | (noun) apoapsis in orbit around the moon | Synonyms: apolune |
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| apparentness | (noun) the property of being apparent | Synonyms: apparency |
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| appealingness | (noun) attractiveness that interests or pleases or stimulates | Synonyms: appeal, charm |
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| appetisingness | (noun) the property of stimulating the appetite | Synonyms: appetizingness |
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| appetizingness | (noun) the property of stimulating the appetite | Synonyms: appetisingness |
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| apportioned | (adjective) given out in portions | Synonyms: dealt out, doled out, meted out, parceled out |
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| appositeness | (noun) appropriateness for the occasion | Synonyms: aptness |
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| appreciativeness | (noun) warm friendly feelings of gratitude | Synonyms: gratefulness, thankfulness |
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| apprehensiveness | (noun) fearful expectation or anticipation | Synonyms: apprehension, dread |
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| appropriateness | (noun) the quality of being specially suitable | - |
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| (noun) appropriate conduct; doing the right thing | Synonyms: rightness |
| aptness | (noun) appropriateness for the occasion | Synonyms: appositeness |
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| (noun) a disposition to behave in a certain way | Synonyms: propensity |
| 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 | - |
| aquaplane | (noun) a board that is pulled by a speedboat as a person stands on it and skims over the top of the water | - |
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| (verb) ride on an aquaplane | - |
| (verb) rise up onto a thin film of water between the tires and road so that there is no more contact with the road | - |
| aquiline | (adjective) curved down like an eagle's beak | Synonyms: hooked |
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| araneidal | (adjective) relating to or resembling a spider | Synonyms: araneidan |
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| araneidan | (adjective) relating to or resembling a spider | Synonyms: araneidal |
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| arbitrariness | (noun) the trait of acting unpredictably and more from whim or caprice than from reason or judgment | Synonyms: capriciousness, flightiness, whimsey, whimsicality, whimsy |
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| arcane | (adjective) requiring secret or mysterious knowledge | - |
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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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| archiannelid | (noun) small primitive marine worm lacking external segmentation and resembling polychaete larvae | - |
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| archine | (noun) a Russian unit of length (71 cm) | - |
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| archness | (noun) inappropriate playfulness | Synonyms: impertinence, perkiness, pertness, sauciness |
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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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| arduousness | (noun) extreme effortfulness | Synonyms: strenuousness |
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| argemone | (noun) any plant of the genus Argemone having large white or yellow flowers and prickly leaves and stems and pods; chiefly of tropical America | Synonyms: devil's fig, prickly poppy, white thistle |
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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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| aridness | (noun) a deficiency of moisture (especially when resulting from a permanent absence of rainfall) | Synonyms: aridity, thirstiness |
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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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| artfulness | (noun) the quality of being adroit in taking unfair advantage | - |
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| articulateness | (noun) the quality of being facile in speech and writing | Synonyms: fluency, volubility |
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| artlessness | (noun) ingenuousness by virtue of being free from artful deceit | - |
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| (noun) the quality of innocent naivete | Synonyms: ingenuousness, innocence, naturalness |