| 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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| acholia | (noun) a condition in which little or no bile is secreted or the flow of bile into the digestive tract is obstructed | Synonyms: cholestasis |
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| achondrite | (noun) a stony meteor lacking chondrules | - |
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| achondroplasia | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasty, chondrodystrophy, osteosclerosis congenita |
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| achondroplasty | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasia, chondrodystrophy, osteosclerosis congenita |
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| anchor | (noun) a mechanical device that prevents a vessel from moving | Synonyms: ground tackle |
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| (noun) a central cohesive source of support and stability | Synonyms: backbone, keystone, linchpin, lynchpin, mainstay |
| (noun) a television reporter who coordinates a broadcast to which several correspondents contribute | Synonyms: anchorman, anchorperson |
| anchorage | (noun) the act of anchoring | - |
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| (noun) place for vessels to anchor | Synonyms: anchorage ground |
| (noun) a fee for anchoring | - |
| (noun) the condition of being secured to a base | - |
| (noun) the provision of a sense of security or steadfastness | - |
| anchorite | (noun) one retired from society for religious reasons | Synonyms: hermit |
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| anchorman | (noun) a television reporter who coordinates a broadcast to which several correspondents contribute | Synonyms: anchor, anchorperson |
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| anchorperson | (noun) a television reporter who coordinates a broadcast to which several correspondents contribute | Synonyms: anchor, anchorman |
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| anchovy | (noun) small herring-like plankton-eating fishes often canned whole or as paste; abundant in tropical waters worldwide | - |
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| (noun) tiny fishes usually canned or salted; used for hors d'oeuvres or as seasoning in sauces | - |
| anticholinergic | (noun) a substance that opposes or blocks the action of acetylcholine | Synonyms: anticholinergic drug |
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| anticholinesterase | (noun) a medicine that inhibits cholinesterase by combining with it and so has a cholinergic effect | - |
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| antipsychotic | (noun) tranquilizer used to treat psychotic conditions when a calming effect is desired | Synonyms: antipsychotic agent, antipsychotic drug, major tranquilizer, major tranquilliser, major tranquillizer, neuroleptic, neuroleptic agent, neuroleptic drug |
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| archosaur | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaurian, archosaurian reptile |
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| archosaurian | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaur, archosaurian reptile |
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| artichoke | (noun) a thistlelike flower head with edible fleshy leaves and heart | Synonyms: globe artichoke |
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| (noun) Mediterranean thistlelike plant widely cultivated for its large edible flower head | Synonyms: artichoke plant, Cynara scolymus, globe artichoke |
| batrachomyomachia | (noun) a silly altercation | - |
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| broncho | (noun) an unbroken or imperfectly broken mustang | Synonyms: bronc, bronco |
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| bronchodilator | (noun) a drug that relaxes and dilates the bronchial passageways and improves the passages of air into the lungs | - |
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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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| bronchospasm | (noun) a spasm of the bronchi that makes exhalation difficult and noisy; associated with asthma and bronchitis | - |
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| cabochon | (noun) a highly polished gem that is cut convexly but without facets | - |
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| cachou | (noun) a scented lozenge used to sweeten the breath (e.g. to conceal the odor of tobacco) | - |
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| caoutchouc | (noun) an elastic material obtained from the latex sap of trees (especially trees of the genera Hevea and Ficus) that can be vulcanized and finished into a variety of products | Synonyms: gum elastic, India rubber, natural rubber, rubber |
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| 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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| cephalochordate | (noun) fish-like animals having a notochord rather than a true spinal column | - |
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| chinchona | (noun) any of several trees of the genus Cinchona | Synonyms: cinchona |
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| choana | (noun) either one of the two posterior openings at the back of the nasal cavity leading to the nasopharynx | Synonyms: internal nostril, posterior nasal aperture |
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| choanocyte | (noun) any of the flagellated cells in sponges having a collar of cytoplasm around the flagellum; they maintain a flow of water through the body | Synonyms: collar cell |
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| choc | (noun) colloquial British abbreviation | - |
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| chock | (noun) a block of wood used to prevent the sliding or rolling of a heavy object | Synonyms: wedge |
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| chocolate | (noun) a medium brown to dark-brown color | Synonyms: burnt umber, coffee, deep brown, umber |
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| (noun) a food made from roasted ground cacao beans | - |
| (noun) a beverage made from cocoa powder and milk and sugar; usually drunk hot | Synonyms: cocoa, drinking chocolate, hot chocolate |
| choice | (noun) the act of choosing or selecting | Synonyms: option, pick, selection |
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| (noun) the person or thing chosen or selected | Synonyms: pick, selection |
| (noun) one of a number of things from which only one can be chosen | Synonyms: alternative, option |
| choiceness | (noun) the quality of being very good indeed | Synonyms: fineness |
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| choir | (noun) the area occupied by singers; the part of the chancel between sanctuary and nave | - |
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| (noun) a chorus that sings as part of a religious ceremony | - |
| (noun) a family of similar musical instrument playing together | Synonyms: consort |
| choirboy | (noun) a boy who sings in a choir | - |
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| choirmaster | (noun) the musical director of a choir | Synonyms: cantor, precentor |
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| choke | (noun) a valve that controls the flow of air into the carburetor of a gasoline engine | - |
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| (noun) a coil of low resistance and high inductance used in electrical circuits to pass direct current and attenuate alternating current | Synonyms: choke coil, choking coil |
| chokecherry | (noun) a common wild cherry of eastern North America having small bitter black berries favored by birds | Synonyms: chokecherry tree, Prunus virginiana |
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| (noun) the fruit of the chokecherry tree | - |
| chokedamp | (noun) the atmosphere in a mine following an explosion; high in carbon dioxide and incapable of supporting life | Synonyms: blackdamp |
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| chokehold | (noun) a restraining hold; someone loops the arm around the neck of another person in a tight grip, usually from behind | Synonyms: choke hold |
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| (noun) complete power over a person or situation | Synonyms: stranglehold, throttlehold |
| chokepoint | (noun) a point of congestion or blockage | - |
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| (noun) a narrowing that reduces the flow through a channel | Synonyms: bottleneck, constriction |
| choker | (noun) a high tight collar | Synonyms: neck ruff, ruff, ruffle |
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| (noun) necklace that fits tightly around a woman's neck | Synonyms: collar, dog collar, neckband |
| (noun) someone who kills by strangling | Synonyms: garroter, garrotter, strangler, throttler |
| (noun) an unfortunate person who is unable to perform effectively because of nervous tension or agitation | - |
| chokey | (noun) British slang (dated) for a prison | Synonyms: choky |
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| choking | (noun) the act of suffocating (someone) by constricting the windpipe | Synonyms: strangling, strangulation, throttling |
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| (noun) a condition caused by blocking the airways to the lungs (as with food or swelling of the larynx) | - |
| choky | (noun) British slang (dated) for a prison | Synonyms: chokey |
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| cholangiography | (noun) roentgenographic examination of the bile ducts after a contrast medium has been injected | - |
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| cholangitis | (noun) inflammation of the bile ducts | - |
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| cholecalciferol | (noun) a fat-soluble vitamin that prevents rickets | Synonyms: calciferol, D, ergocalciferol, viosterol, vitamin D |
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| cholecystectomy | (noun) surgical removal of the gall bladder (usually for relief of gallstone pain) | - |
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| cholecystitis | (noun) inflammation of the gall bladder | - |
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| cholecystokinin | (noun) a gastrointestinal hormone that stimulates the secretion of pancreatic enzymes and the contraction and emptying of the gall bladder; its release is stimulated by the presence of fatty acids and amino acids in the small intestine | - |
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| cholelithiasis | (noun) the presence of gallstones in the gallbladder | - |
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| cholelithotomy | (noun) removal of gallstone through an incision in the gallbladder | - |
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| choler | (noun) a humor that was once believed to be secreted by the liver and to cause irritability and anger | Synonyms: yellow bile |
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| (noun) a strong emotion; a feeling that is oriented toward some real or supposed grievance | Synonyms: anger, ire |
| (noun) an irritable petulant feeling | Synonyms: crossness, fretfulness, fussiness, irritability, peevishness, petulance |
| cholera | (noun) an acute intestinal infection caused by ingestion of contaminated water or food | Synonyms: Asiatic cholera, epidemic cholera, Indian cholera |
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| cholestasis | (noun) a condition in which little or no bile is secreted or the flow of bile into the digestive tract is obstructed | Synonyms: acholia |
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| cholesterin | (noun) an animal sterol that is normally synthesized by the liver; the most abundant steroid in animal tissues | Synonyms: cholesterol |
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| cholesterol | (noun) an animal sterol that is normally synthesized by the liver; the most abundant steroid in animal tissues | Synonyms: cholesterin |
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| choline | (noun) a B-complex vitamin that is a constituent of lecithin; essential in the metabolism of fat | - |
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| cholinesterase | (noun) an enzyme that hydrolyses acetylcholine (into choline and acetic acid) | - |
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| cholla | (noun) arborescent cacti having very spiny cylindrical stem segments; southwestern United States and Mexico | Synonyms: Opuntia cholla |
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| chomp | (noun) the act of gripping or chewing off with the teeth and jaws | Synonyms: bite |
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| chomping | (noun) the act of chewing noisily | - |
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| chon | (noun) 100 chon equal 1 won in North Korea | - |
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| (noun) 100 chon equal 1 won in South Korea | - |
| chondrichthian | (noun) fishes in which the skeleton may be calcified but not ossified | Synonyms: cartilaginous fish |
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| chondrin | (noun) a substance that resembles gelatin and is obtained by boiling cartilage in water | - |
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| chondriosome | (noun) an organelle containing enzymes responsible for producing energy | Synonyms: mitochondrion |
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| chondrite | (noun) a rock of meteoric origin containing chondrules | - |
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| chondrodystrophy | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasia, achondroplasty, osteosclerosis congenita |
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| chondroma | (noun) a common benign tumor of cartilage cells | - |
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| chondrosarcoma | (noun) a malignant neoplasm of cartilage cells | - |
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| chondrule | (noun) small granule (of e.g. chrysolite) found in some meteoric rocks | - |
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| chooser | (noun) a person who chooses or selects out | Synonyms: picker, selector |
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| chop | (noun) a tennis return made with a downward motion that puts backspin on the ball | Synonyms: chop shot |
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| (noun) a grounder that bounces high in the air | Synonyms: chopper |
| (noun) a jaw | - |
| (noun) a small cut of meat including part of a rib | - |
| (noun) the irregular motion of waves (usually caused by wind blowing in a direction opposite to the tide) | - |
| chophouse | (noun) a restaurant that specializes in steaks | Synonyms: steakhouse |
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| chopine | (noun) a woman's shoe with a very high thick sole | Synonyms: platform |
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| chopper | (noun) a grounder that bounces high in the air | Synonyms: chop |
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| (noun) a butcher's knife having a large square blade | Synonyms: cleaver, meat cleaver |
| (noun) an aircraft without wings that obtains its lift from the rotation of overhead blades | Synonyms: eggbeater, helicopter, whirlybird |
| (noun) informal terms for a human `tooth' | Synonyms: pearly |
| choppiness | (noun) used of the sea during inclement or stormy weather | Synonyms: rough water, roughness |
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| chopsteak | (noun) a patty of ground cooked beef | Synonyms: beef patty, chop steak, chopped steak, hamburger steak |
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| chopstick | (noun) one of a pair of slender sticks used as oriental tableware to eat food with | - |
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| choragus | (noun) (ancient Greece) leader of a group or festival; leader of a chorus | - |
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| choral | (noun) a stately Protestant (especially Lutheran) hymn tune | Synonyms: chorale |
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| chorale | (noun) a stately Protestant (especially Lutheran) hymn tune | Synonyms: choral |
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| chord | (noun) a combination of three or more notes that blend harmoniously when sounded together | - |
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| (noun) a straight line connecting two points on a curve | - |
| chordamesoderm | (noun) the area of mesoderm that forms the notochord | Synonyms: chordomesoderm |
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| chordate | (noun) any animal of the phylum Chordata having a notochord or spinal column | - |
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| chorditis | (noun) inflammation of the vocal cords | - |
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| (noun) inflammation of the spermatic cord or vocal cords or vocal folds | - |
| chordomesoderm | (noun) the area of mesoderm that forms the notochord | Synonyms: chordamesoderm |
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| chordophone | (noun) a stringed instrument of the group including harps, lutes, lyres, and zithers | - |
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| chore | (noun) a specific piece of work required to be done as a duty or for a specific fee | Synonyms: job, task |
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| chorea | (noun) any of several degenerative nervous disorders characterized by spasmodic movements of the body and limbs | - |
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| (noun) chorea in dogs | Synonyms: canine chorea |
| choreographer | (noun) someone who creates new dances | - |
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| choreography | (noun) a show involving artistic dancing | Synonyms: stage dancing |
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| (noun) the representation of dancing by symbols as music is represented by notes | - |
| (noun) a notation used by choreographers | - |
| chorine | (noun) a woman who dances in a chorus line | Synonyms: chorus girl, showgirl |
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| chorioallantois | (noun) the very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois | Synonyms: chorioallantoic membrane |
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| choriomeningitis | (noun) a cerebral meningitis with cellular infiltration of the meninges | - |
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| chorion | (noun) the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals) | - |
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