| atrophy | (noun) any weakening or degeneration (especially through lack of use) | Synonyms: withering |
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| (noun) a decrease in size of an organ caused by disease or disuse | Synonyms: wasting, wasting away |
| (verb) undergo atrophy | - |
| 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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| auriscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auroscope, otoscope |
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| auroscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auriscope, otoscope |
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| 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 | - |
| automysophobia | (noun) a morbid fear of being dirty | - |
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| autophyte | (noun) plant capable of synthesizing its own food from simple organic substances | Synonyms: autophytic plant, autotroph, autotrophic organism |
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| autophytic | (adjective) of or relating to organisms (as green plants) that can make complex organic nutritive compounds from simple inorganic sources by photosynthesis | Synonyms: autotrophic |
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| autopilot | (noun) a navigational device that automatically keeps ships or planes or spacecraft on a steady course | Synonyms: automatic pilot, robot pilot |
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| (noun) a cognitive state in which you act without self-awareness | Synonyms: automatic pilot |
| autoplastic | (adjective) of or relating to or involved in autoplasty | - |
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| autoplasty | (noun) surgical repair by using tissue from another part of the patient's own body | - |
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| (noun) tissue that is taken from one site and grafted to another site on the same person | Synonyms: autograft |
| autopsy | (noun) an examination and dissection of a dead body to determine cause of death or the changes produced by disease | Synonyms: necropsy, PM, post-mortem, post-mortem examination, postmortem, postmortem examination |
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| (verb) perform an autopsy on a dead body; do a post-mortem | - |
| autotroph | (noun) plant capable of synthesizing its own food from simple organic substances | Synonyms: autophyte, autophytic plant, autotrophic organism |
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| autotrophic | (adjective) of or relating to organisms (as green plants) that can make complex organic nutritive compounds from simple inorganic sources by photosynthesis | Synonyms: autophytic |
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| axerophthol | (noun) any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes | Synonyms: A, antiophthalmic factor, vitamin A |
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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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| backdrop | (noun) scenery hung at back of stage | Synonyms: backcloth, background |
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| backstop | (noun) a precaution in case of an emergency | - |
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| (noun) (baseball) a fence or screen (as behind home plate) to prevent the ball from traveling out of the playing field | - |
| (noun) (baseball) the person who plays the position of catcher | Synonyms: catcher |
| (verb) act as a backstop | - |
| bacteriochlorophyll | (noun) a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants | - |
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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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| bakeshop | (noun) a workplace where baked goods (breads and cakes and pastries) are produced or sold | Synonyms: bakehouse, bakery |
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| balanoposthitis | (noun) inflammation of both the head of the penis and the foreskin | - |
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| barbershop | (noun) a shop where men can get their hair cut | - |
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| basiscopic | (adjective) facing or on the side toward the base | - |
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| basophil | (noun) a leukocyte with basophilic granules easily stained by basic stains | Synonyms: basophile |
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| basophile | (noun) a leukocyte with basophilic granules easily stained by basic stains | Synonyms: basophil |
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| basophilia | (noun) the tendency of cells to stain with basic dyes | - |
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| basophilic | (adjective) staining readily with basic dyes | - |
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| bebop | (noun) an early form of modern jazz (originating around 1940) | Synonyms: bop |
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| (verb) dance the bebop | Synonyms: bop |
| bedhop | (verb) be sexually active with more than one partner | Synonyms: bed-hop, sleep around |
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| bellhop | (noun) someone employed as an errand boy and luggage carrier around hotels | Synonyms: bellboy, bellman |
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| bibliophile | (noun) someone who loves (and usually collects) books | Synonyms: book lover, booklover |
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| bibliophilic | (adjective) of or relating to bibliophiles | - |
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| bibliopole | (noun) a dealer in secondhand books (especially rare or curious books) | Synonyms: bibliopolist |
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| bibliopolic | (adjective) of or relating to bibliopoles | - |
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| bibliopolist | (noun) a dealer in secondhand books (especially rare or curious books) | Synonyms: bibliopole |
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| biophysicist | (noun) a physicist who applies the methods of physics to biology | - |
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| biophysics | (noun) physics as applied to biological problems | - |
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| biopiracy | (noun) biological theft; illegal collection of indigenous plants by corporations who patent them for their own use | - |
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| biopsy | (noun) examination of tissues or liquids from the living body to determine the existence or cause of a disease | - |
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| bioscope | (noun) a kind of early movie projector | - |
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| (noun) a South African movie theater | - |
| bishop | (noun) (chess) a piece that can be moved diagonally over unoccupied squares of the same color | - |
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| (noun) port wine mulled with oranges and cloves | - |
| (noun) a senior member of the Christian clergy having spiritual and administrative authority; appointed in Christian churches to oversee priests or ministers; considered in some churches to be successors of the twelve Apostles of Christ | - |
| bishopric | (noun) the territorial jurisdiction of a bishop | Synonyms: diocese, episcopate |
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| bishopry | (noun) the office and dignity of a bishop | Synonyms: episcopate |
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| blacktop | (noun) a black bituminous material used for paving roads or other areas; usually spread over crushed rock | Synonyms: blacktopping |
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| (verb) coat with blacktop | - |
| blacktopping | (noun) a black bituminous material used for paving roads or other areas; usually spread over crushed rock | Synonyms: blacktop |
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| blastoporal | (adjective) of or relating to a blastopore | Synonyms: blastoporic |
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| blastopore | (noun) the opening into the archenteron | - |
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| blastoporic | (adjective) of or relating to a blastopore | Synonyms: blastoporal |
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| blooper | (noun) an embarrassing mistake | Synonyms: bloomer, blunder, boner, boo-boo, botch, bungle, flub, foul-up, fuckup, pratfall |
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| bookshop | (noun) a shop where books are sold | Synonyms: bookstall, bookstore |
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| bop | (noun) an early form of modern jazz (originating around 1940) | Synonyms: bebop |
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| (verb) hit hard | Synonyms: bash, bonk, sock, whap, whop |
| (verb) dance the bebop | Synonyms: bebop |
| bopeep | (noun) a game played with young children; you hide your face and suddenly reveal it as you say boo! | Synonyms: peekaboo |
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| boskopoid | (adjective) belonging or relating to or resembling Boskop man | - |
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| boustrophedon | (noun) an ancient writing system: having alternate lines written in opposite directions; literally `as the ox ploughs' | - |
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| boustrophedonic | (adjective) of or relating to writing alternate lines in opposite directions | - |
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| brachiopod | (adjective) of or belonging to the phylum Brachiopoda | Synonyms: brachiopodous |
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| (noun) marine animal with bivalve shell having a pair of arms bearing tentacles for capturing food; found worldwide | Synonyms: lamp shell, lampshell |
| brachiopodous | (adjective) of or belonging to the phylum Brachiopoda | Synonyms: brachiopod |
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| branchiopod | (adjective) of or relating to or characteristic of the subclass Branchiopoda | Synonyms: branchiopodan, branchiopodous |
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| (noun) aquatic crustaceans typically having a carapace and many pairs of leaflike appendages used for swimming as well as respiration and feeding | Synonyms: branchiopod crustacean, branchiopodan |
| branchiopodan | (adjective) of or relating to or characteristic of the subclass Branchiopoda | Synonyms: branchiopod, branchiopodous |
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| (noun) aquatic crustaceans typically having a carapace and many pairs of leaflike appendages used for swimming as well as respiration and feeding | Synonyms: branchiopod, branchiopod crustacean |
| branchiopodous | (adjective) of or relating to or characteristic of the subclass Branchiopoda | Synonyms: branchiopod, branchiopodan |
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| bronchopneumonia | (noun) pneumonia characterized by acute inflammation of the walls of the bronchioles | Synonyms: bronchial pneumonia |
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| bronchoscope | (noun) a slender tubular instrument used to examine the bronchial tubes | - |
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| bronchoscopic | (adjective) of or relating to an instrument for examining the interior of the bronchi | - |
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| bryophyte | (noun) any of numerous plants of the division Bryophyta | Synonyms: nonvascular plant |
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| bryophytic | (adjective) relating to plants of the division Bryophyta | - |
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| businesspeople | (noun) people who transact business (especially business executives) | Synonyms: business people |
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| cacophonic | (adjective) having an unpleasant sound | Synonyms: cacophonous |
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| cacophonous | (adjective) having an unpleasant sound | Synonyms: cacophonic |
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| cacophony | (noun) loud confusing disagreeable sounds | - |
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| (noun) a loud harsh or strident noise | Synonyms: blare, blaring, clamor, din |
| calliope | (noun) a musical instrument consisting of a series of steam whistles played from a keyboard | Synonyms: steam organ |
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| calliopsis | (noun) North American annual widely cultivated for its yellow flowers with purple-red to brownish centers; in some classifications placed in a subgenus Calliopsis | Synonyms: Coreopsis tinctoria |
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| caltrop | (noun) tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed | Synonyms: devil's weed, Tribulus terestris |
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| (noun) Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America | Synonyms: Centauria calcitrapa, star-thistle |
| (noun) a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits | Synonyms: water chestnut, water chestnut plant |
| camelopard | (noun) tallest living quadruped; having a spotted coat and small horns and very long neck and legs; of savannahs of tropical Africa | Synonyms: Giraffa camelopardalis, giraffe |
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| campylotropous | (adjective) (of a plant ovule) curved with the micropyle near the base almost touching its stalk | - |
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| canopied | (adjective) covered with or as with a canopy | - |
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| canopy | (noun) a covering (usually of cloth) that serves as a roof to shelter an area from the weather | - |
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| (noun) the umbrellalike part of a parachute that fills with air | - |
| (noun) the transparent covering of an aircraft cockpit | - |
| (verb) cover with a canopy | - |
| captopril | (noun) a drug (trade name Capoten) that blocks the formation of angiotensin in the kidneys resulting in vasodilation; used in the treatment of hypertension and congestive heart failure | Synonyms: Capoten |
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| cardiomyopathy | (noun) a disorder (usually of unknown origin) of the heart muscle (myocardium) | Synonyms: myocardiopathy |
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| cardiopathy | (noun) a disease of the heart | Synonyms: heart disease |
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| cardiopulmonary | (adjective) of or pertaining to or affecting both the heart and the lungs and their functions | Synonyms: cardiorespiratory |
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| carhop | (noun) a waiter at a drive-in restaurant | - |
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| carpophagous | (adjective) feeding on fruit | Synonyms: fruit-eating |
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| carpophore | (noun) a slender stalk that furnishes an axis for a carpel | - |
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| carrottop | (noun) someone who has red hair | Synonyms: red-header, redhead, redheader |
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| caryophyllaceous | (adjective) of or pertaining to plants of the family Caryophyllaceae | - |
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| caryopsis | (noun) dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn | Synonyms: grain |
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| catastrophe | (noun) an event resulting in great loss and misfortune | Synonyms: calamity, cataclysm, disaster, tragedy |
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| (noun) a sudden violent change in the earth's surface | Synonyms: cataclysm |
| (noun) a state of extreme (usually irremediable) ruin and misfortune | Synonyms: disaster |
| catastrophic | (adjective) extremely harmful; bringing physical or financial ruin | Synonyms: ruinous |
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| catastrophically | (adverb) with unfortunate consequences | - |
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| catoptric | (adjective) of or relating to catoptrics; produced by or based on mirrors | Synonyms: catoptrical |
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| catoptrical | (adjective) of or relating to catoptrics; produced by or based on mirrors | Synonyms: catoptric |
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| catoptrics | (noun) branch of optics dealing with formation of images by mirrors | - |
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| cecropia | (noun) North American silkworm moth; larvae feed on the leaves of forest trees | Synonyms: cecropia moth, Hyalophora cecropia |
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| cefoperazone | (noun) a parenteral cephalosporin (trade name Cefobid) used for severe infections | Synonyms: Cefobid |
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| celioscopy | (noun) endoscopic examination of the abdomen through the abdominal wall | - |
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| cellophane | (noun) a transparent paperlike product that is impervious to moisture and used to wrap candy or cigarettes etc. | - |
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| cephalopod | (adjective) relating or belonging to the class Cephalopoda | Synonyms: cephalopodan |
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| (noun) marine mollusk characterized by well-developed head and eyes and sucker-bearing tentacles | Synonyms: cephalopod mollusk |