| chronograph | (noun) an accurate timer for recording time | - |
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| ciliophoran | (noun) a protozoan with a microscopic appendage extending from the surface of the cell | Synonyms: ciliate, ciliated protozoan |
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| cinematographer | (noun) a photographer who operates a movie camera | Synonyms: camera operator, cameraman |
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| cinematography | (noun) the act of making a film | Synonyms: filming, motion-picture photography |
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| cipher | (noun) a secret method of writing | Synonyms: cryptograph, cypher, secret code |
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| (noun) a message written in a secret code | Synonyms: cypher |
| (noun) a person of no influence | Synonyms: cypher, nobody, nonentity |
| (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cypher, goose egg, nada, naught, nil, nix, nothing, null, zero, zilch, zip, zippo |
| (noun) a mathematical element that when added to another number yields the same number | Synonyms: 0, cypher, nought, zero |
| (verb) make a mathematical calculation or computation | Synonyms: calculate, compute, cypher, figure, reckon, work out |
| (verb) convert ordinary language into code | Synonyms: code, cypher, encipher, encrypt, inscribe, write in code |
| cladophyll | (noun) a flattened stem resembling and functioning as a leaf | Synonyms: cladode, phylloclad, phylloclade |
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| claustrophobe | (noun) a person suffering from claustrophobia | - |
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| claustrophobia | (noun) a morbid fear of being closed in a confined space | - |
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| claustrophobic | (adjective) suffering from claustrophobia; abnormally afraid of closed-in places | - |
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| (adjective) uncomfortably closed or hemmed in | - |
| 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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| 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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| coelophysis | (noun) one of the oldest known dinosaurs; late Triassic; cannibalistic | - |
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| coliphage | (noun) a bacteriophage that infects the bacterium Escherichia coli | - |
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| colophon | (noun) a publisher's emblem printed in a book (usually on the title page) | - |
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| colophony | (noun) translucent brittle substance produced from pine oleoresin; used especially in varnishes and inks and on the bows of stringed instruments | - |
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| conidiophore | (noun) a specialized fungal hypha that produces conidia | - |
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| coprophagia | (noun) eating feces; in human a symptom of some kinds of insanity | Synonyms: coprophagy |
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| coprophagy | (noun) eating feces; in human a symptom of some kinds of insanity | Synonyms: coprophagia |
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| corticotrophin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, adrenocorticotropin, corticotropin |
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| coryphantha | (noun) a cactus of the genus Coryphantha | - |
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| cosmographer | (noun) a scientist knowledgeable about cosmography | Synonyms: cosmographist |
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| cosmographist | (noun) a scientist knowledgeable about cosmography | Synonyms: cosmographer |
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| cosmography | (noun) a representation of the earth or the heavens | - |
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| (noun) the science that maps the general features of the universe; describes both heaven and earth (but without encroaching on geography or astronomy) | - |
| crotaphion | (noun) the tip of the greater wing of the sphenoid bone | - |
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| cryophobia | (noun) a morbid fear of freezing | - |
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| cryptograph | (noun) a device for deciphering codes and ciphers | - |
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| (noun) a piece of writing in code or cipher | Synonyms: cryptogram, secret writing |
| (noun) a secret method of writing | Synonyms: cipher, cypher, secret code |
| cryptographer | (noun) decoder skilled in the analysis of codes and cryptograms | Synonyms: cryptanalyst, cryptologist |
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| cryptographic | (adjective) of or relating to cryptanalysis | Synonyms: cryptanalytic, cryptographical, cryptologic, cryptological |
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| cryptographical | (adjective) of or relating to cryptanalysis | Synonyms: cryptanalytic, cryptographic, cryptologic, cryptological |
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| cryptographically | (adverb) in a cryptographic manner | - |
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| cryptography | (noun) act of writing in code or cipher | Synonyms: coding, secret writing, steganography |
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| (noun) the science of analyzing and deciphering codes and ciphers and cryptograms | Synonyms: cryptanalysis, cryptanalytics, cryptology |
| cryptophyte | (noun) common in fresh and salt water appearing along the shore as algal blooms | Synonyms: cryptomonad |
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| crystallographer | (noun) a specialist in crystallography | - |
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| crystallography | (noun) the branch of science that studies the formation and structure of crystals | - |
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| 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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| cyanophyte | (adjective) relating to or caused by photosynthetic bacteria of the class Cyanobacteria | Synonyms: cyanobacterial |
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| cyberphobia | (noun) irrational fear of computers or technology | - |
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| cymograph | (noun) scientific instrument consisting of a rotating drum holding paper on which a stylus traces a continuous record (as of breathing or blood pressure) | Synonyms: kymograph |
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| cynophobia | (noun) a morbid fear of dogs | - |
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| cypher | (noun) a secret method of writing | Synonyms: cipher, cryptograph, secret code |
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| (noun) a message written in a secret code | Synonyms: cipher |
| (noun) a person of no influence | Synonyms: cipher, nobody, nonentity |
| (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, goose egg, nada, naught, nil, nix, nothing, null, zero, zilch, zip, zippo |
| (noun) a mathematical element that when added to another number yields the same number | Synonyms: 0, cipher, nought, zero |
| (verb) make a mathematical calculation or computation | Synonyms: calculate, cipher, compute, figure, reckon, work out |
| (verb) convert ordinary language into code | Synonyms: cipher, code, encipher, encrypt, inscribe, write in code |
| cytophotometer | (noun) a photometer that can be used to locate and identify chemical compounds in a cell by measuring the intensity of the light that passes through stained sections of the cytoplasm | - |
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| cytophotometric | (adjective) of or relating to the study of cells by means of a cytophotometer | - |
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| cytophotometrically | (adverb) by cytophotometric means | - |
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| cytophotometry | (noun) the study of chemical compounds inside a cell by means of a cytophotometer | - |
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| daphne | (noun) any of several ornamental shrubs with shiny mostly evergreen leaves and clusters of small bell-shaped flowers | - |
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| daphnia | (noun) minute freshwater crustacean having a round body enclosed in a transparent shell; moves about like a flea by means of hairy branched antennae | Synonyms: water flea |
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| dauphin | (noun) formerly, the eldest son of the King of France and direct heir to the throne | - |
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| decipher | (verb) read with difficulty | Synonyms: trace |
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| (verb) convert code into ordinary language | Synonyms: decode, decrypt |
| decipherable | (adjective) easily deciphered | Synonyms: clear, readable |
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| decipherably | (adverb) in a legible manner | Synonyms: legibly, readably |
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| deciphered | (adjective) converted from cryptic to intelligible language | - |
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| decipherer | (noun) a reader capable of reading and interpreting illegible or obscure text | - |
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| (noun) the kind of intellectual who converts messages from a code to plain text | Synonyms: decoder |
| decipherment | (noun) the activity of making clear or converting from code into plain text | Synonyms: decoding, decryption |
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| deipnosophist | (noun) someone skilled at informal chitchat | - |
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| delphinium | (noun) any plant of the genus Delphinium having palmately divided leaves and showy spikes of variously colored spurred flowers; some contain extremely poisonous substances | - |
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| demographer | (noun) a scientist who studies the growth and density of populations and their vital statistics | Synonyms: demographist, population scientist |
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| demographic | (adjective) of or relating to demography | - |
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| (noun) a statistic characterizing human populations (or segments of human populations broken down by age or sex or income etc.) | - |
| demographist | (noun) a scientist who studies the growth and density of populations and their vital statistics | Synonyms: demographer, population scientist |
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| demography | (noun) the branch of sociology that studies the characteristics of human populations | Synonyms: human ecology |
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| deoxyephedrine | (noun) an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant | Synonyms: chalk, chicken feed, crank, glass, ice, meth, methamphetamine, methamphetamine hydrochloride, Methedrine, shabu, trash |
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| dermatoglyphic | (noun) the lines that form patterns on the skin (especially on the fingertips and the palms of the hands and the soles of the feet) | - |
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| dermatoglyphics | (noun) the study of the whorls and loops and arches in the fingertips and on the palms of the hand and the soles of the feet | - |
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| dermatophytosis | (noun) fungal infection of the skin (especially of moist parts covered by clothing) | Synonyms: dermatomycosis |
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| desulphurize | (verb) remove sulfur from | Synonyms: desulfurize |
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| diacetylmorphine | (noun) a narcotic that is considered a hard drug; a highly addictive morphine derivative; intravenous injection provides the fastest and most intense rush | Synonyms: heroin |
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| diaglyph | (noun) glyptic art consisting of a sunken or depressed engraving or carving on a stone or gem (as opposed to cameo) | Synonyms: intaglio |
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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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| diaphanous | (adjective) so thin as to transmit light | Synonyms: cobwebby, filmy, gauze-like, gauzy, gossamer, see-through, sheer, transparent, vaporous, vapourous |
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| diapheromera | (noun) a variety of stick insect | Synonyms: Diapheromera femorata |
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| diaphone | (noun) a foghorn that makes a signal consisting of two tones | - |
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| diaphoresis | (noun) the process of the sweat glands of the skin secreting a salty fluid | Synonyms: hidrosis, perspiration, sudation, sweating |
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| diaphoretic | (adjective) inducing perspiration | Synonyms: sudorific |
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| (noun) used to produce perspiration | - |
| diaphragm | (noun) a mechanical device in a camera that controls size of aperture of the lens | Synonyms: stop |
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| (noun) electro-acoustic transducer that vibrates to receive or produce sound waves | - |
| (noun) a contraceptive device consisting of a flexible dome-shaped cup made of rubber or plastic; it is filled with spermicide and fitted over the uterine cervix | Synonyms: contraceptive diaphragm, pessary |
| (noun) (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration | Synonyms: midriff |
| diaphyseal | (adjective) relating to the diaphysis of a bone | Synonyms: diaphysial |
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| diaphysial | (adjective) relating to the diaphysis of a bone | Synonyms: diaphyseal |
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| diaphysis | (noun) the main (mid) section of a long bone | Synonyms: shaft |
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| diastrophism | (noun) the process of deformation that produces continents and ocean basins in the earth's crust | - |
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| dichlorodiphenyltrichloroethane | (noun) an insecticide that is also toxic to animals and humans; banned in the United States since 1972 | Synonyms: DDT |
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| diencephalon | (noun) the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon | Synonyms: betweenbrain, interbrain, thalmencephalon |
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| digraph | (noun) two successive letters (especially two letters used to represent a single sound: `sh' in `shoe') | Synonyms: digram |
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| dihydroxyphenylalanine | (noun) amino acid that is formed in the liver and converted into dopamine in the brain | Synonyms: dopa |
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| dimorphic | (adjective) occurring or existing in two different forms | Synonyms: dimorphous |
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| dimorphism | (noun) (biology) the existence of two forms of individual within the same animal species (independent of sex differences) | - |
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| (noun) (chemistry) the property of certain substances that enables them to exist in two distinct crystalline forms | - |
| dimorphous | (adjective) occurring or existing in two different forms | Synonyms: dimorphic |
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| diphenhydramine | (noun) antihistamine (trade name Benadryl) used to treat allergic reactions involving the nasal passages (hay fever) and also to treat motion sickness | Synonyms: Benadryl |
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| diphenylhydantoin | (noun) an anticonvulsant drug (trade name Dilantin) used to treat epilepsy and that is not a sedative | Synonyms: Dilantin, phenytoin |
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| diphtheria | (noun) acute contagious infection caused by the bacterium Corynebacterium diphtheriae; marked by the formation of a false membrane in the throat and other air passages causing difficulty in breathing | - |
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| diphthong | (noun) a vowel sound that starts near the articulatory position for one vowel and moves toward the position for another | - |
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| diphthongise | (verb) change from a simple vowel to a diphthong | Synonyms: diphthongize |
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| diphthongize | (verb) change from a simple vowel to a diphthong | Synonyms: diphthongise |
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| discography | (noun) a descriptive catalog of musical recordings | - |
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| dolichocephalic | (adjective) having a relatively long head with a cephalic index of under 75 | Synonyms: dolichocranial, dolichocranic |
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| (noun) an adult with a long narrow head | - |
| dolichocephalism | (noun) the quality of being dolichocephalic | Synonyms: dolichocephaly |
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| dolichocephaly | (noun) the quality of being dolichocephalic | Synonyms: dolichocephalism |
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| dolphin | (noun) any of various small toothed whales with a beaklike snout; larger than porpoises | - |
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| (noun) large slender food and game fish widely distributed in warm seas (especially around Hawaii) | Synonyms: dolphinfish, mahimahi |
| dolphinfish | (noun) large slender food and game fish widely distributed in warm seas (especially around Hawaii) | Synonyms: dolphin, mahimahi |
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| (noun) the lean flesh of a saltwater fish found in warm waters (especially in Hawaii) | Synonyms: mahimahi |
| drosophila | (noun) small fruit fly used by Thomas Hunt Morgan in studying basic mechanisms of inheritance | Synonyms: Drosophila melanogaster |
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| dysaphia | (noun) a disorder in the sense of touch | - |
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| dysgraphia | (noun) impaired ability to learn to write | - |
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