| adulterine | (adjective) conceived in adultery | - |
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| aerial | (adjective) existing or living or growing or operating in the air | - |
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| (adjective) characterized by lightness and insubstantiality; as impalpable or intangible as air | Synonyms: aeriform, aery, airy, ethereal |
| (noun) a pass to a receiver downfield from the passer | Synonyms: forward pass |
| (noun) an electrical device that sends or receives radio or television signals | Synonyms: antenna, transmitting aerial |
| aerialist | (noun) an acrobat who performs in the air (as on a rope or trapeze) | - |
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| aerially | (adverb) by means of aircraft | - |
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| aerides | (noun) any orchid of the genus Aerides | - |
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| aerie | (noun) any habitation at a high altitude | Synonyms: aery, eyrie, eyry |
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| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aery, eyrie, eyry |
| aeriferous | (adjective) conveying air; as the bronchial tubes | - |
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| aeriform | (adjective) resembling air or having the form of air | Synonyms: airlike |
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| (adjective) characterized by lightness and insubstantiality; as impalpable or intangible as air | Synonyms: aerial, aery, airy, ethereal |
| aerify | (verb) turn into gas | Synonyms: gasify, vaporise, vaporize |
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| afterimage | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: aftersensation |
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| alfileria | (noun) European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage | Synonyms: alfilaria, clocks, Erodium cicutarium, filaree, filaria, pin clover, pin grass, redstem storksbill |
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| allomerism | (noun) (chemistry) variability in chemical composition without variation in crystalline form | - |
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| alphameric | (adjective) of or pertaining to alphanumeric characters | Synonyms: alphamerical, alphanumeric, alphanumerical |
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| alphamerical | (adjective) of or pertaining to alphanumeric characters | Synonyms: alphameric, alphanumeric, alphanumerical |
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| alphanumeric | (adjective) of or pertaining to alphanumeric characters | Synonyms: alphameric, alphamerical, alphanumerical |
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| alphanumerical | (adjective) of or pertaining to alphanumeric characters | Synonyms: alphameric, alphamerical, alphanumeric |
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| alphanumerics | (noun) a character set that includes letters and digits and punctuation | Synonyms: alphanumeric characters |
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| alstroemeria | (noun) any of various South American plants of the genus Alstroemeria valued for their handsome umbels of beautiful flowers | - |
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| altering | (noun) the sterilization of an animal | Synonyms: fixing, neutering |
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| ambidexterity | (noun) the property of being equally skillful with each hand | Synonyms: ambidextrousness |
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| americium | (noun) a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms | Synonyms: Am, atomic number 95 |
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| 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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| amphoteric | (adjective) having characteristics of both an acid and a base and capable of reacting as either | Synonyms: amphiprotic |
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| amphotericin | (noun) an antibiotic and antifungal agent | - |
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| angiopteris | (noun) highly variable species of very large primitive ferns of the Pacific tropical areas with high rainfall | Synonyms: Angiopteris evecta, giant fern |
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| anicteric | (adjective) without jaundice | - |
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| (adjective) not affected by jaundice | - |
| anoperineal | (adjective) relating to the anus and surrounding perineum | - |
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| anserine | (adjective) of or resembling a goose | - |
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| (adjective) having or revealing stupidity | Synonyms: dopey, dopy, foolish, gooselike, goosey, goosy, jerky |
| answering | (adjective) replying | Synonyms: respondent |
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| antemeridian | (adjective) before noon | - |
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| anterior | (adjective) of or near the head end or toward the front plane of a body | - |
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| (adjective) earlier in time | Synonyms: prior |
| (noun) a tooth situated at the front of the mouth | Synonyms: front tooth |
| anteriority | (noun) the quality of being in front or (in lower animals) toward the head | - |
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| (noun) preceding in time | Synonyms: antecedence, antecedency, precedence, precedency, priority |
| anteriorly | (adverb) in an anterior direction | - |
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| antheridial | (adjective) relating to or characterized by an antheridium | - |
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| antheridiophore | (noun) gametophore bearing antheridia as in certain mosses and liverworts | - |
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| antheridium | (noun) the male sex organ of spore-producing plants; produces antherozoids; equivalent to the anther in flowers | - |
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| antibacterial | (adjective) destroying bacteria or inhibiting their growth | - |
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| (noun) any drug that destroys bacteria or inhibits their growth | Synonyms: antibacterial drug, bactericide |
| aperient | (adjective) mildly laxative | - |
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| (noun) a purging medicine; stimulates evacuation of the bowels | Synonyms: cathartic, physic, purgative |
| aperiodic | (adjective) not recurring at regular intervals | Synonyms: nonperiodic |
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| aperitif | (noun) alcoholic beverage taken before a meal as an appetizer | - |
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| archaebacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacterium, archaeobacteria, archeobacteria |
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| archaebacterium | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaeobacteria, archeobacteria |
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| archaeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archeobacteria |
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| archeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archaeobacteria |
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| arteria | (noun) a blood vessel that carries blood from the heart to the body | Synonyms: arterial blood vessel, artery |
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| arterial | (adjective) of or involving or contained in the arteries | - |
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| arterialise | (verb) change venous blood into arterial blood | Synonyms: arterialize |
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| arterialize | (verb) change venous blood into arterial blood | Synonyms: arterialise |
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| arteriectasia | (noun) an abnormal distension of an artery | Synonyms: arteriectasis |
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| arteriectasis | (noun) an abnormal distension of an artery | Synonyms: arteriectasia |
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| arteriogram | (noun) an X ray of an artery filled with a contrast medium | - |
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| arteriography | (noun) roentgenographic examination of arteries | - |
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| arteriola | (noun) one of the small thin-walled arteries that end in capillaries | Synonyms: arteriole, capillary artery |
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| arteriolar | (adjective) of or relating to or involving arterioles | - |
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| arteriole | (noun) one of the small thin-walled arteries that end in capillaries | Synonyms: arteriola, capillary artery |
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| arteriolosclerosis | (noun) sclerosis of the arterioles | - |
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| arteriosclerosis | (noun) sclerosis of the arterial walls | Synonyms: arterial sclerosis, coronary-artery disease, hardening of the arteries, induration of the arteries |
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| arteriosclerotic | (adjective) affected by arteriosclerosis | - |
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| arteriovenous | (adjective) connecting an artery to a vein | - |
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| arteritis | (noun) inflammation of an artery | - |
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| arthromeric | (adjective) of or relating to one of the body segments of jointed animals | - |
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| asperity | (noun) something hard to endure | Synonyms: grimness, hardship, rigor, rigorousness, rigour, rigourousness, severeness, severity |
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| (noun) harshness of manner | Synonyms: sharpness |
| aspheric | (adjective) varying slightly from a perfectly spherical shape | Synonyms: aspherical |
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| aspherical | (adjective) varying slightly from a perfectly spherical shape | Synonyms: aspheric |
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| asteriated | (adjective) (of some crystals especially gemstones) exhibiting asterism | - |
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| asterion | (noun) the craniometric point at the junction of the lamboid suture and the occipitomastoid suture and the parietomastoid suture | - |
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| asterisk | (noun) a star-shaped character * used in printing | Synonyms: star |
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| (verb) mark with an asterisk | Synonyms: star |
| asterisked | (adjective) marked with an asterisk | Synonyms: starred |
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| asterism | (noun) (astronomy) a cluster of stars (or a small constellation) | - |
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| (noun) (mineralogy) a star-shaped figure with six rays that is seen in some crystal structures under reflected or transmitted light | - |
| asterismal | (adjective) relating to asterisms or constellations | - |
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| atmospheric | (adjective) relating to or located in the atmosphere | Synonyms: atmospherical |
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| atmospherical | (adjective) relating to or located in the atmosphere | Synonyms: atmospheric |
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| atmospherics | (noun) a crackling or hissing noise caused by electrical interference | Synonyms: atmospheric static, static |
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| austerity | (noun) the trait of great self-denial (especially refraining from worldly pleasures) | Synonyms: asceticism, nonindulgence |
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| bacteria | (noun) (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants | Synonyms: bacterium |
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| bacteriacide | (noun) any chemical agent that destroys bacteria | Synonyms: bactericide |
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| bacteriaemia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteremia, bacteriemia |
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| bacterial | (adjective) relating to or caused by bacteria | - |
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| bacterially | (adverb) by bacteria | - |
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| bactericidal | (adjective) preventing infection by inhibiting the growth or action of microorganisms | Synonyms: disinfectant, germicidal |
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| bactericide | (noun) any drug that destroys bacteria or inhibits their growth | Synonyms: antibacterial, antibacterial drug |
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| (noun) any chemical agent that destroys bacteria | Synonyms: bacteriacide |
| bacteriemia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteremia, bacteriaemia |
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| bacteriochlorophyll | (noun) a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants | - |
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| bacterioid | (adjective) resembling bacteria | Synonyms: bacterioidal, bacteroid, bacteroidal |
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| bacterioidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacteroid, bacteroidal |
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| bacteriologic | (adjective) of or relating to bacteriology | Synonyms: bacteriological |
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| bacteriological | (adjective) of or relating to bacteriology | Synonyms: bacteriologic |
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| bacteriologist | (noun) a biologist who studies bacteria | - |
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| bacteriology | (noun) the branch of medical science that studies bacteria in relation to disease | - |
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| bacteriolysis | (noun) dissolution or destruction of bacteria | - |
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| bacteriolytic | (adjective) of or relating to or causing bacteriolysis | - |
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| bacteriophage | (noun) a virus that is parasitic (reproduces itself) in bacteria | Synonyms: phage |
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| bacteriophagic | (adjective) of or relating to bacteriophages | Synonyms: bacteriophagous |
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| bacteriophagous | (adjective) of or relating to bacteriophages | Synonyms: bacteriophagic |
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| bacteriostasis | (noun) inhibition of the growth of bacteria | - |
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| bacteriostat | (noun) a chemical or biological material that inhibits bacterial growth | - |
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| bacteriostatic | (adjective) of or relating to or causing bacteriostasis | - |
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| bacterise | (verb) subject to the action of bacteria | Synonyms: bacterize |
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| bacterium | (noun) (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants | Synonyms: bacteria |
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| bacterize | (verb) subject to the action of bacteria | Synonyms: bacterise |
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