| celluloid | (noun) a medium that disseminates moving pictures | Synonyms: cinema, film |
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| (noun) highly flammable substance made from cellulose nitrate and camphor; used in e.g. motion-picture and X-ray film; its use has decreased with the development of nonflammable thermoplastics | - |
| cellulose | (noun) a polysaccharide that is the chief constituent of all plant tissues and fibers | - |
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| cellulosic | (noun) a plastic made from cellulose (or a derivative of cellulose) | - |
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| celom | (noun) a cavity in the mesoderm of an embryo that gives rise in humans to the pleural cavity and pericardial cavity and peritoneal cavity | Synonyms: celoma, coelom |
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| celoma | (noun) a cavity in the mesoderm of an embryo that gives rise in humans to the pleural cavity and pericardial cavity and peritoneal cavity | Synonyms: celom, coelom |
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| cembalo | (noun) a clavier with strings that are plucked by plectra mounted on pivots | Synonyms: harpsichord |
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| cephalochordate | (noun) fish-like animals having a notochord rather than a true spinal column | - |
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| cephaloglycin | (noun) antibiotic related to cephalosporin but no longer in common use | Synonyms: Kafocin |
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| cephalohematoma | (noun) a collection of blood under the scalp of a newborn; caused by pressure during birth | Synonyms: cephalhematoma |
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| cephalometry | (noun) measurement of human heads | - |
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| cephalopod | (noun) marine mollusk characterized by well-developed head and eyes and sucker-bearing tentacles | Synonyms: cephalopod mollusk |
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| cephaloridine | (noun) a broad spectrum semisynthetic antibiotic produced by modifying cephalosporin | - |
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| cephalosporin | (noun) one of several broad spectrum antibiotic substances obtained from fungi and related to penicillin (trade names Mefoxin); addition of side chains has produced semisynthetic antibiotics with greater antibacterial activity | Synonyms: Mefoxin |
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| cephalothin | (noun) a semisynthetic analogue of cephalosporin | - |
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| cerecloth | (noun) a waterproof waxed cloth once used as a shroud | - |
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| ceylonite | (noun) a dark-colored spinel containing iron | Synonyms: pleonaste |
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| chadlock | (noun) weedy Eurasian plant often a pest in grain fields | Synonyms: Brassica kaber, charlock, field mustard, Sinapis arvensis, wild mustard |
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| chancellor | (noun) the person who is head of government (in several countries) | Synonyms: premier, prime minister |
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| (noun) the honorary or titular head of a university | - |
| chancellorship | (noun) the office of chancellor | - |
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| charlock | (noun) weedy Eurasian plant often a pest in grain fields | Synonyms: Brassica kaber, chadlock, field mustard, Sinapis arvensis, wild mustard |
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| charlotte | (noun) a mold lined with cake or crumbs and filled with fruit or whipped cream or custard | - |
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| checkerbloom | (noun) perennial purple-flowered wild mallow of western North America that is also cultivated | Synonyms: Sidalcea malviflora, wild hollyhock |
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| cheesecloth | (noun) a coarse loosely woven cotton gauze; originally used to wrap cheeses | - |
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| cheeseflower | (noun) erect or decumbent Old World perennial with axillary clusters of rosy-purple flowers; introduced in United States | Synonyms: cheese, high mallow, Malva sylvestris, tall mallow |
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| cheiloschisis | (noun) a congenital cleft in the middle of the upper lip | Synonyms: cleft lip, harelip |
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| cheiloscopy | (noun) a forensic investigation technique that deals with identification of humans based on lip traces. | - |
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| cheilosis | (noun) a disorder of the lips marked by scaling and fissures at the corners of the mouth; caused by a deficiency of riboflavin | Synonyms: perleche |
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| cheloid | (noun) raised pinkish scar tissue at the site of an injury; results from excessive tissue repair | Synonyms: keloid |
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| chelonian | (noun) a reptile of the order Chelonia | Synonyms: chelonian reptile |
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| chemoimmunology | (noun) the field of chemistry concerned with chemical processes in immunology (such as chemical studies of antigens and antibodies) | Synonyms: immunochemistry |
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| chiggerflower | (noun) erect perennial of eastern and southern United States having showy orange flowers | Synonyms: Asclepias tuberosa, butterfly weed, chigger flower, Indian paintbrush, orange milkweed, pleurisy root, tuber root |
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| chinchillon | (noun) gregarious burrowing rodent larger than the chinchillas | Synonyms: Lagostomus maximus, viscacha |
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| chirology | (noun) telling fortunes by lines on the palm of the hand | Synonyms: chiromancy, palm reading, palmistry |
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| chloasma | (noun) a tan discoloration of a woman's face that is associated with pregnancy or with the use of oral contraceptives | Synonyms: mask of pregnancy, melasma |
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| chlorambucil | (noun) an alkylating agent (trade name Leukeran) used to treat some kinds of cancer | Synonyms: Leukeran |
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| chloramine | (noun) any of several compounds containing chlorine and nitrogen; used as an antiseptic in wounds | Synonyms: chloramine-T |
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| chloramphenicol | (noun) an oral antibiotic (trade name Chloromycetin) used to treat serious infections (especially typhoid fever) | Synonyms: Chloromycetin |
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| chlorate | (noun) any salt of chloric acid | - |
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| chlordiazepoxide | (noun) a tranquilizer (trade names Librium and Libritabs) used in the treatment of alcoholism | Synonyms: Libritabs, Librium |
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| chlorella | (noun) any alga of the genus Chlorella | - |
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| chlorenchyma | (noun) parenchyma whose cells contain chloroplasts | - |
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| chlorhexidine | (noun) a long-lasting liquid antiseptic; used by surgeons to wash their hands before performing surgery | - |
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| chloride | (noun) any compound containing a chlorine atom | - |
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| (noun) any salt of hydrochloric acid (containing the chloride ion) | - |
| chlorination | (noun) disinfection of water by the addition of small amounts of chlorine or a chlorine compound | - |
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| (noun) the addition or substitution of chlorine in organic compounds | - |
| chlorine | (noun) a common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water) | Synonyms: atomic number 17, Cl |
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| chlorinity | (noun) a measure of the quantity of chlorine or other halides in water (especially seawater) | - |
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| chlorite | (noun) a generally green or black mineral; it occurs as a constituent of many rocks typically in the form of a flat crystal | - |
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| chloroacetophenone | (noun) a tear gas that is weaker than CS gas but lasts longer | Synonyms: CN gas |
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| chlorobenzene | (noun) a colorless volatile flammable liquid with an almond odor that is made from chlorine and benzene; used as a solvent and in the production of phenol and DDT and other organic compounds | - |
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| chlorobenzylidenemalononitrile | (noun) a tear gas that is stronger than CN gas but wears off faster; can be deployed by grenades or cluster bombs; can cause skin burns and fatal pulmonary edema | Synonyms: CS gas |
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| chlorofluorocarbon | (noun) a fluorocarbon with chlorine; formerly used as a refrigerant and as a propellant in aerosol cans | Synonyms: CFC |
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| chloroform | (noun) a volatile liquid haloform (CHCl3); formerly used as an anesthetic | Synonyms: trichloromethane |
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| chlorofucin | (noun) the chlorophyll present in brown algae, diatoms, and flagellates | Synonyms: chlorophyll c |
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| chlorophyl | (noun) any of a group of green pigments found in photosynthetic organisms; there are four naturally occurring forms | Synonyms: chlorophyll |
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| chlorophyll | (noun) any of a group of green pigments found in photosynthetic organisms; there are four naturally occurring forms | Synonyms: chlorophyl |
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| chlorophyte | (noun) algae that are clear green in color; often growing on wet ricks or damp wood or the surface of stagnant water | Synonyms: green algae |
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| chloropicrin | (noun) a heavy colorless insoluble liquid compound that causes tears and vomiting; used as a pesticide and as tear gas | Synonyms: nitrochloroform |
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| chloroplast | (noun) plastid containing chlorophyll and other pigments; in plants that carry out photosynthesis | - |
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| chloroplatinate | (noun) any salt of chloroplatinic acid. | - |
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| chloroprene | (noun) derivative of butadiene used in making neoprene by polymerization | - |
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| chloroquine | (noun) an antimalarial drug used to treat malaria and amebic dysentery and systemic lupus erythematosus | - |
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| chlorosis | (noun) iron deficiency anemia in young women; characterized by weakness and menstrual disturbances and a green color to the skin | Synonyms: greensickness |
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| chlorothiazide | (noun) a diuretic drug (trade name Diuril) used in the treatment of edema and hypertension | Synonyms: Diuril |
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| chlorpromazine | (noun) a drug (trade name Thorazine) derived from phenothiazine that has antipsychotic effects and is used as a sedative and tranquilizer | Synonyms: Thorazine |
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| chlorpyrifos | (noun) a common organophosphate insecticide | - |
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| chlortetracycline | (noun) a yellow crystalline antibiotic (trade name Aureomycin) used to treat certain bacterial and rickettsial diseases | Synonyms: Aureomycin |
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| chlorthalidone | (noun) a diuretic (trade names Hygroton and Thalidone) used to control hypertension and conditions that cause edema; effective in lowering blood pressure to prevent heart attacks | Synonyms: Hygroton, Thalidone |
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| chronology | (noun) the determination of the actual temporal sequence of past events | - |
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| (noun) a record of events in the order of their occurrence | - |
| (noun) an arrangement of events in time | - |
| chyloderma | (noun) swelling of the scrotum resulting from chronic lymphatic obstruction | Synonyms: elephantiasis scroti |
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| chylomicron | (noun) a microscopic particle of triglycerides produced in the intestines during digestion; in the bloodstream they release their fatty acids into the blood | - |
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| cigarillo | (noun) small cigar or cigarette wrapped in tobacco instead of paper | - |
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| ciprofloxacin | (noun) an oral antibiotic (trade name Cipro) used against serious bacterial infections of the skin or respiratory tract or urinary tract or bones or joints | Synonyms: Cipro |
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| circumlocution | (noun) a style that involves indirect ways of expressing things | Synonyms: ambage, periphrasis |
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| (noun) an indirect way of expressing something | Synonyms: indirect expression |
| climatologist | (noun) someone who is expert in climatology | - |
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| climatology | (noun) meteorology of climates and their phenomena | - |
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| cloaca | (noun) a waste pipe that carries away sewage or surface water | Synonyms: sewer, sewerage |
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| (noun) (zoology) the cavity (in birds, reptiles, amphibians, most fish, and monotremes but not other mammals) at the end of the digestive tract into which the intestinal, genital, and urinary tracts open | - |
| cloak | (noun) a loose outer garment | - |
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| (noun) anything that covers or conceals | - |
| cloakmaker | (noun) someone whose occupation is making or repairing fur garments | Synonyms: furrier |
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| cloakroom | (noun) a room where coats and other articles can be left temporarily | Synonyms: coatroom |
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| (noun) a private lounge off of a legislative chamber | - |
| clobber | (noun) informal terms for personal possessions | Synonyms: stuff |
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| clochard | (noun) a wanderer who has no established residence or visible means of support | Synonyms: drifter, floater, vagabond, vagrant |
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| cloche | (noun) a woman's close-fitting hat that resembles a helmet | - |
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| (noun) a low transparent cover put over young plants to protect them from cold | - |
| clock | (noun) a timepiece that shows the time of day | - |
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| clocking | (noun) the time taken to traverse a measured course | - |
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| clockmaker | (noun) someone whose occupation is making or repairing clocks and watches | Synonyms: clocksmith |
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| clocks | (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, alfileria, Erodium cicutarium, filaree, filaria, pin clover, pin grass, redstem storksbill |
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| clocksmith | (noun) someone whose occupation is making or repairing clocks and watches | Synonyms: clockmaker |
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| clockwork | (noun) any mechanism of geared wheels that is driven by a coiled spring; resembles the works of a mechanical clock | - |
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| clod | (noun) a compact mass | Synonyms: ball, chunk, clump, glob, lump |
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| (noun) an awkward stupid person | Synonyms: gawk, goon, lout, lubber, lummox, lump, oaf, stumblebum |
| clodhopper | (noun) a thick and heavy shoe | Synonyms: brogan, brogue, work shoe |
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| clofibrate | (noun) a drug (trade name Atromid-S) that reduces lipids in the blood serum; used to treat some cardiovascular diseases | Synonyms: Atromid-S |
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| clog | (noun) a dance performed while wearing shoes with wooden soles; has heavy stamping steps | Synonyms: clog dance, clog dancing |
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| (noun) any object that acts as a hindrance or obstruction | - |
| (noun) footwear usually with wooden soles | Synonyms: geta, patten, sabot |
| cloisonne | (noun) enamelware in which colored areas are separated by thin metal strips | - |
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| cloister | (noun) residence that is a place of religious seclusion (such as a monastery) | Synonyms: religious residence |
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| (noun) a courtyard with covered walks (as in religious institutions) | - |
| clomiphene | (noun) a fertility drug (trade name Clomid) that is used to stimulate ovulation and that has been associated with multiple births | Synonyms: Clomid, clomiphene citrate |
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| clomipramine | (noun) a tricyclic antidepressant drug | - |
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| clon | (noun) a group of genetically identical cells or organisms derived from a single cell or individual by some kind of asexual reproduction | Synonyms: clone |
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| clone | (noun) an unauthorized copy or imitation | Synonyms: knockoff |
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| (noun) a group of genetically identical cells or organisms derived from a single cell or individual by some kind of asexual reproduction | Synonyms: clon |
| (noun) a person who is almost identical to another | Synonyms: dead ringer, ringer |
| clonidine | (noun) an antihypertensive (trade name Catapres) that can be administered orally or via transdermal patches | Synonyms: Catapres |
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| cloning | (noun) a general term for the research activity that creates a copy of some biological entity (a gene or organism or cell) | - |
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