| crossbeam | (noun) a horizontal beam that extends across something | Synonyms: crosspiece, trave, traverse |
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| cryptogam | (noun) formerly recognized taxonomic group including all flowerless and seedless plants that reproduce by means of spores: ferns, mosses, algae, fungi | - |
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| cryptogram | (noun) a piece of writing in code or cipher | Synonyms: cryptograph, secret writing |
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| cryptorchidism | (noun) failure of one or both testes to move into the scrotum as the male fetus develops | Synonyms: cryptorchidy, cryptorchism |
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| cryptorchism | (noun) failure of one or both testes to move into the scrotum as the male fetus develops | Synonyms: cryptorchidism, cryptorchidy |
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| ctenidium | (noun) comb-like respiratory structure serving as the gill of certain mollusks | - |
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| cubism | (noun) an artistic movement in France beginning in 1907 that featured surfaces of geometrical planes | - |
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| cuckoldom | (noun) the state of a husband whose wife has committed adultery | - |
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| culm | (noun) stem of plants of the Gramineae | - |
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| cultism | (noun) religious zeal; the willingness to serve God | Synonyms: devotion, veneration |
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| (noun) devotion to the doctrine or a cult or to the practices of a cult | - |
| cum | (noun) the thick white fluid containing spermatozoa that is ejaculated by the male genital tract | Synonyms: come, ejaculate, seed, semen, seminal fluid |
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| cuneiform | (noun) an ancient wedge-shaped script used in Mesopotamia and Persia | - |
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| curium | (noun) a radioactive transuranic metallic element; produced by bombarding plutonium with helium nuclei | Synonyms: atomic number 96, Cm |
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| curriculum | (noun) an integrated course of academic studies | Synonyms: course of study, program, programme, syllabus |
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| custom | (noun) accepted or habitual practice | Synonyms: usage, usance |
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| (noun) habitual patronage | - |
| (noun) a specific practice of long standing | Synonyms: tradition |
| (noun) money collected under a tariff | Synonyms: customs, customs duty, impost |
| cutworm | (noun) North American moth whose larvae feed on young plant stems cutting them off at the ground | - |
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| cwm | (noun) a steep-walled semicircular basin in a mountain; may contain a lake | Synonyms: cirque, corrie |
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| cymatium | (noun) (architecture) a molding for a cornice; in profile it is shaped like an S (partly concave and partly convex) | Synonyms: cyma |
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| cymbidium | (noun) any of various plants of the genus Cymbidium having narrow leaves and a long drooping cluster of numerous showy and variously colored boat-shaped flowers; extensively hybridized and cultivated as houseplants and important florists' flowers | Synonyms: cymbid |
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| cynancum | (noun) any of various mostly giant tropical lianas of Africa and Madagascar having greenish or purple flowers and long smooth pods; roots formerly used as an emetic | - |
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| cynicism | (noun) a cynical feeling of distrust | - |
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| cytoplasm | (noun) the protoplasm of a cell excluding the nucleus; is full of proteins that control cell metabolism | Synonyms: cytol |
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| dadaism | (noun) a nihilistic art movement (especially in painting) that flourished in Europe early in the 20th century; based on irrationality and negation of the accepted laws of beauty | Synonyms: dada |
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| dam | (noun) female parent of an animal especially domestic livestock | - |
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| (noun) a barrier constructed to contain the flow of water or to keep out the sea | Synonyms: dike, dyke |
| (noun) a metric unit of length equal to ten meters | Synonyms: decameter, decametre, dekameter, dekametre, dkm |
| dandyism | (noun) the manner and dress of a fop or dandy | Synonyms: foppishness |
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| darkroom | (noun) a room in which photographs are developed | - |
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| darmstadtium | (noun) a radioactive transuranic element, with atomic number 110 | Synonyms: atomic number 110, Ds, element 110 |
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| dashcam | (noun) A camera filming from the dashboard of a car | - |
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| datum | (noun) an item of factual information derived from measurement or research | Synonyms: data point |
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| daydream | (noun) absentminded dreaming while awake | Synonyms: air castle, castle in Spain, castle in the air, daydreaming, oneirism, reverie, revery |
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| decagram | (noun) 10 grams | Synonyms: dag, dekagram, dkg |
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| decennium | (noun) a period of 10 years | Synonyms: decade, decennary |
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| decigram | (noun) 1/10 gram | Synonyms: dg |
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| deconstructionism | (noun) a philosophical theory of criticism (usually of literature or film) that seeks to expose deep-seated contradictions in a work by delving below its surface meaning | Synonyms: deconstruction |
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| deconstructivism | (noun) a school of architecture based on the philosophical theory of deconstruction | - |
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| decorum | (noun) propriety in manners and conduct | Synonyms: decorousness |
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| defeatism | (noun) acceptance of the inevitability of defeat | - |
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| deism | (noun) the form of theological rationalism that believes in God on the basis of reason without reference to revelation | Synonyms: free thought |
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| dekagram | (noun) 10 grams | Synonyms: dag, decagram, dkg |
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| deliquium | (noun) a spontaneous loss of consciousness caused by insufficient blood to the brain | Synonyms: faint, swoon, syncope |
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| delirium | (noun) a usually brief state of excitement and mental confusion often accompanied by hallucinations | - |
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| (noun) state of violent mental agitation | Synonyms: craze, frenzy, fury, hysteria |
| 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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| democratism | (noun) the theory, system, or principles of democracy. | - |
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| demonism | (noun) a belief in and reverence for devils (especially Satan) | Synonyms: diabolism, Satanism |
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| dendrobium | (noun) a plant of the genus Dendrobium having stems like cane and usually showy racemose flowers | - |
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| denim | (noun) a coarse durable twill-weave cotton fabric | Synonyms: dungaree, jean |
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| (noun) (used in the plural) close-fitting trousers of heavy denim for manual work or casual wear | Synonyms: blue jeans, jeans |
| 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 | - |
| denotatum | (noun) an actual object referred to by a linguistic expression | - |
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| descriptivism | (noun) (linguistics) a doctrine supporting or promoting descriptive linguistics | - |
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| (noun) (ethics) a doctrine holding that moral statements have a truth value | - |
| desideratum | (noun) something desired as a necessity | - |
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| designatum | (noun) something (whether existing or not) that is referred to by a linguistic expression | - |
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| despotism | (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: absolutism, authoritarianism, Caesarism, dictatorship, monocracy, one-man rule, shogunate, Stalinism, totalitarianism, tyranny |
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| (noun) dominance through threat of punishment and violence | Synonyms: absolutism, tyranny |
| determinism | (noun) (philosophy) a philosophical theory holding that all events are inevitable consequences of antecedent sufficient causes; often understood as denying the possibility of free will | - |
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| deuterium | (noun) an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen) | Synonyms: heavy hydrogen |
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| deviationism | (noun) ideological defection from the party line (especially from orthodox communism) | - |
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| diabolism | (noun) a belief in and reverence for devils (especially Satan) | Synonyms: demonism, Satanism |
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| diadem | (noun) an ornamental jeweled headdress signifying sovereignty | Synonyms: crown |
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| diagram | (noun) a drawing intended to explain how something works; a drawing showing the relation between the parts | - |
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| dialogism | (noun) the use in a text of different tones or viewpoints, whose interaction or contradiction is important to the text's interpretation. | - |
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| diam | (noun) the length of a straight line passing through the center of a circle and connecting two points on the circumference | Synonyms: diameter |
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| diamagnetism | (noun) phenomenon exhibited by materials like copper or bismuth that become magnetized in a magnetic field with a polarity opposite to the magnetic force; unlike iron they are slightly repelled by a magnet | - |
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| 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 |
| diastrophism | (noun) the process of deformation that produces continents and ocean basins in the earth's crust | - |
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| diatom | (noun) microscopic unicellular marine or freshwater colonial alga having cell walls impregnated with silica | - |
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| diazepam | (noun) a tranquilizer (trade name Valium) used to relieve anxiety and relax muscles; acts by enhancing the inhibitory actions of the neurotransmitter GABA; can also be used as an anticonvulsant drug in cases of nerve agent poisoning | Synonyms: Valium |
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| diazonium | (noun) the univalent cation R-N:N- (where R is an aromatic hydrocarbon); found in salts that are used in manufacturing azo dyes | - |
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| dichroism | (noun) pleochroism of a crystal so that it exhibits two different colors when viewed from two different directions | - |
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| dichromatism | (noun) a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision) | Synonyms: dichromacy, dichromasy, dichromatopsia, dichromia |
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| dictostylium | (noun) any slime mold of the genus Dictostylium | - |
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| dictum | (noun) an authoritative declaration | Synonyms: pronouncement, say-so |
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| (noun) an opinion voiced by a judge on a point of law not directly bearing on the case in question and therefore not binding | Synonyms: obiter dictum |
| didacticism | (noun) communication that is suitable for or intended to be instructive | - |
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| diestrum | (noun) (of animals having several estrous cycles in one breeding season) a state or interval of sexual inactivity or quiescence between periods of activity | Synonyms: diestrus |
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| digram | (noun) two successive letters (especially two letters used to represent a single sound: `sh' in `shoe') | Synonyms: digraph |
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| diltiazem | (noun) a calcium blocker (trade name Cardizem) used in treating hypertension or angina or heart failure | Synonyms: Cardizem |
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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 | - |
| dirham | (noun) worth one tenth of a Kuwaiti dinar; equal 100 fils | Synonyms: Kuwaiti dirham |
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| (noun) 100 dirhams equal 1 dinar in Libya | Synonyms: Libyan dirham |
| (noun) 100 dirhams equal 1 dinar in Tunisia | Synonyms: Tunisian dirham |
| (noun) the basic unit of money in Morocco; equal to 100 centimes | Synonyms: Moroccan dirham |
| (noun) the basic unit of money in the United Arab Emirates; equal to 100 fils | Synonyms: United Arab Emirate dirham |
| (noun) 100 dirhams equal 1 riyal in Qatar | Synonyms: Qatari dirham |
| disequilibrium | (noun) loss of equilibrium attributable to an unstable situation in which some forces outweigh others | - |
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| disesteem | (noun) the state in which esteem has been lost | - |
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| disulfiram | (noun) a drug (trade name Antabuse) used in the treatment of alcoholism; causes nausea and vomiting if alcohol is ingested | Synonyms: Antabuse |
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| diverticulum | (noun) a herniation through the muscular wall of a tubular organ (especially the colon) | - |
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| dkm | (noun) a metric unit of length equal to ten meters | Synonyms: dam, decameter, decametre, dekameter, dekametre |
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| dm | (noun) a metric unit of length equal to one tenth of a meter | Synonyms: decimeter, decimetre |
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| dogmatism | (noun) tendency to assert principles as undeniably true | - |
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| dolichocephalism | (noun) the quality of being dolichocephalic | Synonyms: dolichocephaly |
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| doliolum | (noun) free-swimming oceanic tunicate with a barrel-shaped transparent body | - |
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| domatium | (noun) a part of a plant (e.g., a leaf) that has been modified to provide protection for insects or mites or fungi | - |
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| doom | (noun) an unpleasant or disastrous destiny | Synonyms: day of reckoning, doomsday, end of the world |
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| dorm | (noun) a college or university building containing living quarters for students | Synonyms: dormitory, hall, residence hall, student residence |
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| dorsum | (noun) the back of the body of a vertebrate or any analogous surface (as the upper or outer surface of an organ or appendage or part) | - |
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| (noun) the posterior part of a human (or animal) body from the neck to the end of the spine | Synonyms: back |
| drachm | (noun) a unit of apothecary weight equal to an eighth of an ounce or to 60 grains | Synonyms: drachma, dram |
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| (noun) a unit of capacity or volume in the apothecary system equal to one eighth of a fluid ounce | Synonyms: fluid drachm, fluid dram, fluidram |
| (noun) a British imperial capacity measure (liquid or dry) equal to 60 minims or 3.5516 cubic centimeters | Synonyms: fluid drachm, fluid dram, fluidram |
| dracontium | (noun) any plant of the genus Dracontium; strongly malodorous tropical American plants usually with gigantic leaves | - |
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| dram | (noun) the basic unit of money in Armenia | - |
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| (noun) 1/16 ounce or 1.771 grams | - |
| (noun) a unit of apothecary weight equal to an eighth of an ounce or to 60 grains | Synonyms: drachm, drachma |
| dream | (noun) a series of mental images and emotions occurring during sleep | Synonyms: dreaming |
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| (noun) imaginative thoughts indulged in while awake | Synonyms: dreaming |
| (noun) a fantastic but vain hope (from fantasies induced by the opium pipe) | Synonyms: pipe dream |
| (noun) a state of mind characterized by abstraction and release from reality | - |
| (noun) a cherished desire | Synonyms: ambition, aspiration |
| (noun) someone or something wonderful | - |
| druidism | (noun) the system of religion and philosophy taught by the Druids and their rites and ceremonies | - |
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| drum | (noun) small to medium-sized bottom-dwelling food and game fishes of shallow coastal and fresh waters that make a drumming noise | Synonyms: drumfish |
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| (noun) a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretched across each end | Synonyms: membranophone, tympan |
| (noun) a cylindrical metal container, commonly used for shipping or storage of liquids | Synonyms: metal drum |
| (noun) a hollow cast iron cylinder attached to the wheel that forms part of the brakes | Synonyms: brake drum |
| (noun) the sound of a drum | - |
| (noun) a bulging cylindrical shape; hollow with flat ends | Synonyms: barrel |
| dualism | (noun) the doctrine that reality consists of two basic opposing elements, often taken to be mind and matter (or mind and body), or good and evil | - |
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| dubnium | (noun) a transuranic element with atomic number 105 | Synonyms: atomic number 105, Db, element 105, hahnium |
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| dukedom | (noun) the domain controlled by a duke or duchess | Synonyms: duchy |
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| (noun) the dignity or rank or position of a duke | - |
| dumdum | (noun) a soft-nosed small-arms bullet that expands when it hits a target and causes a gaping wound | Synonyms: dumdum bullet |
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| duodenum | (noun) the part of the small intestine between the stomach and the jejunum | - |
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