| 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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| 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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| chronograph | (noun) an accurate timer for recording time | - |
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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 | - |
| chronometer | (noun) an accurate clock (especially used in navigation) | - |
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| chronoscope | (noun) an instrument for accurate measurements of small intervals of time | - |
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| clinocephalism | (noun) a congenital defect in which the top of the head is depressed (concave instead of convex) | Synonyms: clinocephaly |
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| clinocephaly | (noun) a congenital defect in which the top of the head is depressed (concave instead of convex) | Synonyms: clinocephalism |
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| clinodactyly | (noun) a congenital defect in which one or more toes or fingers are abnormally positioned | - |
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| clinometer | (noun) an instrument used by surveyors in order to measure an angle of inclination or elevation | Synonyms: inclinometer |
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| coenobite | (noun) a member of a religious order living in common | Synonyms: cenobite |
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| cognomen | (noun) the name used to identify the members of a family (as distinguished from each member's given name) | Synonyms: family name, last name, surname |
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| (noun) a familiar name for a person (often a shortened version of a person's given name) | Synonyms: byname, moniker, nickname, sobriquet, soubriquet |
| cognoscente | (noun) an expert able to appreciate a field; especially in the fine arts | Synonyms: connoisseur |
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| colonoscope | (noun) an elongated fiberoptic endoscope for examining the entire colon from cecum to rectum | - |
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| colonoscopy | (noun) visual examination of the colon (with a colonoscope) from the cecum to the rectum; requires sedation | - |
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| conenose | (noun) large bloodsucking bug | Synonyms: big bedbug, cone-nosed bug, conenose bug, kissing bug |
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| connoisseur | (noun) an expert able to appreciate a field; especially in the fine arts | Synonyms: cognoscente |
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| connoisseurship | (noun) love of or taste for fine objects of art | Synonyms: vertu, virtu |
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| connotation | (noun) an idea that is implied or suggested | - |
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| (noun) what you must know in order to determine the reference of an expression | Synonyms: intension |
| conodont | (noun) small (2 inches long) extinct eellike fish with a finned tail and a notochord and having cone-shaped teeth containing cellular bone; late Cambrian to late Triassic; possible predecessor of the cyclostomes | - |
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| (noun) the tiny fossil cone-shaped tooth of a primitive vertebrate of order Conodonta | - |
| conoid | (noun) a shape whose base is a circle and whose sides taper up to a point | Synonyms: cone, cone shape |
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| consignor | (noun) the person who delivers over or commits merchandise | Synonyms: consigner |
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| contadino | (noun) an Italian farmer | - |
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| countertenor | (noun) the highest adult male singing voice | Synonyms: alto |
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| (noun) a male singer with a voice above that of a tenor | - |
| criminologist | (noun) a specialist in criminology | - |
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| criminology | (noun) the scientific study of crime and criminal behavior and law enforcement | - |
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| crinoid | (noun) primitive echinoderms having five or more feathery arms radiating from a central disk | - |
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| crinoline | (noun) a stiff coarse fabric used to stiffen hats or clothing | - |
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| (noun) a full stiff petticoat made of crinoline fabric | - |
| (noun) a skirt stiffened with hoops | Synonyms: hoopskirt |
| ctenophore | (noun) biradially symmetrical hermaphroditic solitary marine animals resembling jellyfishes having for locomotion eight rows of cilia arranged like teeth in a comb | Synonyms: comb jelly |
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| cyanobacteria | (noun) predominantly photosynthetic prokaryotic organisms containing a blue pigment in addition to chlorophyll; occur singly or in colonies in diverse habitats; important as phytoplankton | Synonyms: blue-green algae |
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| cyanocobalamin | (noun) a B vitamin that is used to treat pernicious anemia | Synonyms: antipernicious anemia factor, cobalamin, vitamin B12 |
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| cyanogen | (noun) a colorless toxic gas with a pungent almond odor; has been used in chemical warfare | - |
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| cyanohydrin | (noun) any organic compound in which the cyano radical -CN and the hydroxyl radical -OH are attached to the same carbon atom | - |
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| cyanosis | (noun) a bluish discoloration of the skin and mucous membranes | - |
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| cyclohexanol | (noun) a colorless oily alcohol that smells like camphor | - |
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| cynodont | (noun) small carnivorous reptiles | - |
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| cynophobia | (noun) a morbid fear of dogs | - |
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| cynosure | (noun) something that strongly attracts attention and admiration | - |
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| (noun) something that provides guidance (as Polaris guides mariners) | - |
| cyprinodont | (noun) any member of the family Cyprinodontidae | - |
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| daminozide | (noun) a chemical sprayed on fruit trees to regulate their growth so the entire crop can be harvested at one time | Synonyms: Alar |
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| declinometer | (noun) an instrument for measuring magnetic declination | Synonyms: transit declinometer |
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| dehydroretinol | (noun) a viscous alcohol that is less active in mammals than is vitamin A1 | Synonyms: vitamin A2 |
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| deinocheirus | (noun) lightly built medium-sized theropod with long limbs and neck | - |
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| deinonychus | (noun) swift agile wolf-sized bipedal dinosaur having a large curved claw on each hind foot; of the Cretaceous | - |
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| deipnosophist | (noun) someone skilled at informal chitchat | - |
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| demeanor | (noun) (behavioral attributes) the way a person behaves toward other people | Synonyms: behavior, behaviour, conduct, demeanour, deportment |
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| demeanour | (noun) (behavioral attributes) the way a person behaves toward other people | Synonyms: behavior, behaviour, conduct, demeanor, deportment |
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| demonolatry | (noun) the acts or rites of worshiping devils | Synonyms: devil-worship, diabolatry |
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| denomination | (noun) identifying word or words by which someone or something is called and classified or distinguished from others | Synonyms: appellation, appellative, designation |
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| (noun) a group of religious congregations having its own organization and a distinctive faith | - |
| (noun) a class of one kind of unit in a system of numbers or measures or weights or money | - |
| denominationalism | (noun) a narrow-minded adherence to a particular sect or party or denomination | Synonyms: sectarianism |
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| (noun) the tendency, in Protestantism, to separate into religious denominations or to advocate such separations | - |
| denominator | (noun) the divisor of a fraction | - |
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| denotation | (noun) the most direct or specific meaning of a word or expression; the class of objects that an expression refers to | Synonyms: extension, reference |
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| (noun) the act of indicating or pointing out by name | Synonyms: indication |
| denotatum | (noun) an actual object referred to by a linguistic expression | - |
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| denouement | (noun) the final resolution of the main complication of a literary or dramatic work | - |
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| (noun) the outcome of a complex sequence of events | - |
| denouncement | (noun) a public act of denouncing | Synonyms: denunciation |
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| deoxyadenosine | (noun) a nucleoside component of DNA; composed of adenosine and deoxyribose | - |
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| deoxyguanosine | (noun) a nucleoside component of DNA; composed of guanine and deoxyribose | Synonyms: guanosine |
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| deuteranopia | (noun) dichromacy characterized by a lowered sensitivity to green light resulting in an inability to distinguish green and purplish-red | Synonyms: Daltonism, green-blindness |
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| diagnosing | (noun) identifying the nature or cause of some phenomenon | Synonyms: diagnosis |
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| diagnosis | (noun) identifying the nature or cause of some phenomenon | Synonyms: diagnosing |
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| diagnostician | (noun) a doctor who specializes in medical diagnosis | Synonyms: pathologist |
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| diagnostics | (noun) the branch of medical science dealing with the classification of disease | Synonyms: nosology |
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| diaphanoscope | (noun) An instrument for illuminating the interior of a cavity to determine the translucency of its walls. | - |
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| dicynodont | (noun) a kind of therapsid | - |
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| didanosine | (noun) an antiviral drug used to combat HIV infection, a reverse transcriptase inhibitor | Synonyms: ddI, DDI, dideoxyinosine |
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| dideoxyinosine | (noun) an antiviral drug used to combat HIV infection, a reverse transcriptase inhibitor | Synonyms: ddI, DDI, didanosine |
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| dinoceras | (noun) a variety of dinocerate | Synonyms: uintathere |
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| dinocerate | (noun) an extinct ungulate | - |
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| dinoflagellate | (noun) chiefly marine protozoa having two flagella; a chief constituent of plankton | - |
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| dinosaur | (noun) any of numerous extinct terrestrial reptiles of the Mesozoic era | - |
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| dishonor | (noun) lacking honor or integrity | Synonyms: dishonour |
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| (noun) a state of shame or disgrace | Synonyms: dishonour |
| dishonorableness | (noun) the quality of not deserving honor or respect | Synonyms: dishonourableness |
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| dishonour | (noun) lacking honor or integrity | Synonyms: dishonor |
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| (noun) a state of shame or disgrace | Synonyms: dishonor |
| dishonourableness | (noun) the quality of not deserving honor or respect | Synonyms: dishonorableness |
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| domino | (noun) a small rectangular block used in playing the game of dominoes; the face of each block has two equal areas that can bear 0 to 6 dots | - |
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| (noun) a mask covering the upper part of the face but with holes for the eyes | Synonyms: eye mask, half mask |
| (noun) a loose hooded cloak worn with a half mask as part of a masquerade costume | - |
| dominoes | (noun) any of several games played with small rectangular blocks | Synonyms: dominos |
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| dominos | (noun) any of several games played with small rectangular blocks | Synonyms: dominoes |
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| donor | (noun) person who makes a gift of property | Synonyms: bestower, conferrer, giver, presenter |
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| (noun) (medicine) someone who gives blood or tissue or an organ to be used in another person (the host) | - |
| doorknob | (noun) a knob used to release the catch when opening a door (often called `doorhandle' in Great Britain) | Synonyms: doorhandle |
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| doorknocker | (noun) a device (usually metal and ornamental) attached by a hinge to a door | Synonyms: knocker, rapper |
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| dreadnought | (noun) battleship that has big guns all of the same caliber | Synonyms: dreadnaught |
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| dronabinol | (noun) psychoactive substance present in marijuana; used therapeutically to control nausea associated with cancer therapy | - |
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| dunnock | (noun) small brownish European songbird | Synonyms: hedge sparrow, Prunella modularis, sparrow |
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| dysmenorrhea | (noun) painful menstruation | - |
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| dyspnoea | (noun) difficult or labored respiration | Synonyms: dyspnea |
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| echinocactus | (noun) any cactus of the genus Echinocactus; strongly ribbed and very spiny; southwestern United States to Brazil | Synonyms: barrel cactus |
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| echinococcosis | (noun) infestation with larval echinococci (tapeworms) | Synonyms: hydatid disease, hydatidosis |
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| echinococcus | (noun) tapeworms whose larvae are parasitic in humans and domestic animals | - |
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| echinoderm | (noun) marine invertebrates with tube feet and five-part radially symmetrical bodies | - |
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| econometrician | (noun) an economist who uses statistical and mathematical methods | Synonyms: econometrist |
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| econometrics | (noun) the application of mathematics and statistics to the study of economic and financial data | - |
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| econometrist | (noun) an economist who uses statistical and mathematical methods | Synonyms: econometrician |
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| economics | (noun) the branch of social science that deals with the production and distribution and consumption of goods and services and their management | Synonyms: economic science, political economy |
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| economiser | (noun) a frugal person who limits spending and avoids waste | Synonyms: economizer |
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| economist | (noun) an expert in the science of economics | Synonyms: economic expert |
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| economizer | (noun) a frugal person who limits spending and avoids waste | Synonyms: economiser |
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| economy | (noun) an act of economizing; reduction in cost | Synonyms: saving |
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| (noun) frugality in the expenditure of money or resources | Synonyms: thriftiness |
| (noun) the efficient use of resources | - |
| (noun) the system of production and distribution and consumption | Synonyms: economic system |
| eggnog | (noun) a punch made of sweetened milk or cream mixed with eggs and usually alcoholic liquor | - |
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| electroretinogram | (noun) a graphical recording of the electrical activity of the retina that results when light is flashed into the eye | - |
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| endocrinologist | (noun) physician who specializes in the diagnosis and treatment of conditions affecting the endocrine system | - |
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