| columbium | (noun) a former name for niobium | - |
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| combretum | (noun) any of numerous shrubs or small trees of the genus Combretum having spikes of small flowers | - |
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| compendium | (noun) a concise but comprehensive summary of a larger work | - |
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| (noun) a publication containing a variety of works | Synonyms: collection |
| condominium | (noun) housing consisting of a complex of dwelling units (as an apartment house) in which each unit is individually owned | - |
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| (noun) one of the dwelling units in a condominium | Synonyms: condo |
| conidium | (noun) an asexually produced fungal spore formed on a conidiophore | Synonyms: conidiospore |
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| consortium | (noun) an association of companies for some definite purpose | Synonyms: pool, syndicate |
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| continuum | (noun) a continuous nonspatial whole or extent or succession in which no part or portion is distinct or distinguishable from adjacent parts | - |
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| conundrum | (noun) a difficult problem | Synonyms: brain-teaser, enigma, riddle |
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| corium | (noun) the deep vascular inner layer of the skin | Synonyms: derma, dermis |
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| corneum | (noun) the outermost layer of the epidermis consisting of dead cells that slough off | Synonyms: horny layer, stratum corneum |
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| corrigendum | (noun) a printer's error; to be corrected | - |
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| corundum | (noun) very hard mineral used as an abrasive | Synonyms: corundom |
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| corynebacterium | (noun) any species of the genus Corynebacterium | - |
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| cranium | (noun) the part of the skull that encloses the brain | Synonyms: braincase, brainpan |
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| credendum | (noun) (Christianity) any of the sections into which a creed or other statement of doctrine is divided | Synonyms: article of faith |
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| crematorium | (noun) a furnace where a corpse can be burned and reduced to ashes | Synonyms: cremation chamber, crematory |
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| (noun) a mortuary where corpses are cremated | Synonyms: crematory |
| criterium | (noun) a bicycle race held on a short course (usually less than 5 km or 3 miles) | Synonyms: crit |
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| ctenidium | (noun) comb-like respiratory structure serving as the gill of certain mollusks | - |
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| 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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| 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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| 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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| darmstadtium | (noun) a radioactive transuranic element, with atomic number 110 | Synonyms: atomic number 110, Ds, element 110 |
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| datum | (noun) an item of factual information derived from measurement or research | Synonyms: data point |
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| decennium | (noun) a period of 10 years | Synonyms: decade, decennary |
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| decorum | (noun) propriety in manners and conduct | Synonyms: decorousness |
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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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| dendrobium | (noun) a plant of the genus Dendrobium having stems like cane and usually showy racemose flowers | - |
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| denotatum | (noun) an actual object referred to by a linguistic expression | - |
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| 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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| deuterium | (noun) an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen) | Synonyms: heavy hydrogen |
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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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| 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 |
| 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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| disequilibrium | (noun) loss of equilibrium attributable to an unstable situation in which some forces outweigh others | - |
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| diverticulum | (noun) a herniation through the muscular wall of a tubular organ (especially the colon) | - |
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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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| 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 |
| dracontium | (noun) any plant of the genus Dracontium; strongly malodorous tropical American plants usually with gigantic leaves | - |
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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 |
| (verb) study intensively, as before an exam | Synonyms: bone, bone up, cram, get up, grind away, mug up, swot, swot up |
| (verb) play a percussion instrument | - |
| (verb) make a rhythmic sound | Synonyms: beat, thrum |
| dubnium | (noun) a transuranic element with atomic number 105 | Synonyms: atomic number 105, Db, element 105, hahnium |
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| 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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| durum | (noun) wheat with hard dark-colored kernels high in gluten and used for bread and pasta; grown especially in southern Russia, North Africa, and northern central North America | Synonyms: durum wheat, hard wheat, macaroni wheat, Triticum durum, Triticum turgidum |
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| dysprosium | (noun) a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic | Synonyms: atomic number 66, Dy |
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| eardrum | (noun) the membrane in the ear that vibrates to sound | Synonyms: myringa, tympanic membrane, tympanum |
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| effluvium | (noun) a foul-smelling outflow or vapor (especially a gaseous waste) | - |
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| einsteinium | (noun) a radioactive transuranic element produced by bombarding plutonium with neutrons | Synonyms: atomic number 99, E, Es |
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| electrum | (noun) an alloy of gold and silver | - |
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| emporium | (noun) a large retail store organized into departments offering a variety of merchandise; commonly part of a retail chain | Synonyms: department store |
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| emunctorium | (noun) a white linen cloth which is used to wipe the chalice after each communicant partakes. | Synonyms: purificator, purificatorium |
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| encomium | (noun) a formal expression of praise | Synonyms: eulogy, paean, panegyric, pean |
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| endocardium | (noun) the membrane that lines the cavities of the heart and forms part of the heart valves | - |
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| endocranium | (noun) membrane lining the inside of the skull | - |
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| endometrium | (noun) (pregnancy) the mucous membrane that lines the uterus; thickens under hormonal control and (if pregnancy does not occur) is shed in menstruation; if pregnancy occurs it is shed along with the placenta at parturition | - |
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| endoneurium | (noun) delicate connective tissue around individual nerve fibers in nerve | - |
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| endosteum | (noun) vascular membrane that lines the inner surface of long bones | - |
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| endothelium | (noun) an epithelium of mesoblastic origin; a thin layer of flattened cells that lines the inside of some body cavities | - |
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| epicardium | (noun) the innermost of the two layers of the pericardium | Synonyms: visceral pericardium |
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| epicranium | (noun) the muscle and aponeurosis and skin covering the cranium | - |
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| epigastrium | (noun) the region lying on or over the stomach (just below the sternum) | - |
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| epimythium | (noun) a moral at the end of a story. | - |
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| epiphyllum | (noun) any cactus of the genus Epiphyllum having flattened jointed irregularly branching stems and showy tubular flowers | Synonyms: orchid cactus |
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| epithalamium | (noun) an ode honoring a bride and bridegroom | - |
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| epithelium | (noun) membranous tissue covering internal organs and other internal surfaces of the body | Synonyms: epithelial tissue |
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| equilibrium | (noun) a sensory system located in structures of the inner ear that registers the orientation of the head | Synonyms: labyrinthine sense, sense of balance, sense of equilibrium, vestibular sense |
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| (noun) a chemical reaction and its reverse proceed at equal rates | Synonyms: chemical equilibrium |
| (noun) equality of distribution | Synonyms: balance, counterbalance, equipoise |
| (noun) a stable situation in which forces cancel one another | - |
| erbium | (noun) a trivalent metallic element of the rare earth group; occurs with yttrium | Synonyms: atomic number 68, Er |
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| eriogonum | (noun) any plant of the genus Eriogonum with small clustered flowers | - |
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| erratum | (noun) a mistake in printed matter resulting from mechanical failures of some kind | Synonyms: literal, literal error, misprint, typo, typographical error |
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| eubacterium | (noun) a large group of bacteria having rigid cell walls; motile types have flagella | Synonyms: eubacteria, true bacteria |
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| eulogium | (noun) a formal expression of praise for someone who has died recently | Synonyms: eulogy |
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| euphonium | (noun) a bass horn (brass wind instrument) that is the tenor of the tuba family | - |
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| euphorbium | (noun) an acrid brown gum resin now used mainly in veterinary medicine | Synonyms: gum eurphorbium |
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| europium | (noun) a bivalent and trivalent metallic element of the rare earth group | Synonyms: atomic number 63, Eu |
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| eusporangium | (noun) a sporangium that arises from a group of epidermal cells | - |
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| exordium | (noun) (rhetoric) the introductory section of an oration or discourse | - |
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| explanandum | (noun) (logic) a statement of something (a fact or thing or expression) to be explained | Synonyms: explicandum |
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| explicandum | (noun) (logic) a statement of something (a fact or thing or expression) to be explained | Synonyms: explanandum |
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| extremum | (noun) the point located farthest from the middle of something | Synonyms: extreme, extreme point |
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| (noun) the most extreme possible amount or value | Synonyms: peak |
| factotum | (noun) a servant employed to do a variety of jobs | - |
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| fermium | (noun) a radioactive transuranic metallic element produced by bombarding plutonium with neutrons | Synonyms: atomic number 100, Fm |
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| ferrocerium | (noun) a pyrophoric alloy of iron with cerium; used for lighter flints | - |
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| filum | (noun) a threadlike structure (as a chainlike series of cells) | Synonyms: filament |
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| flagellum | (noun) a lash-like appendage used for locomotion (e.g., in sperm cells and some bacteria and protozoa) | - |
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| (noun) a whip used to inflict punishment | Synonyms: scourge |
| flerovium | (noun) a radioactive transuranic element | Synonyms: Fl |
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| florilegium | (noun) an anthology of short literary pieces and poems and ballads etc. | Synonyms: garland, miscellany |
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| folium | (noun) a thin layer or stratum of (especially metamorphic) rock | - |
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| forum | (noun) a public facility to meet for open discussion | Synonyms: assembly, meeting place |
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| (noun) a public meeting or assembly for open discussion | - |
| francium | (noun) a radioactive element of the alkali-metal group discovered as a disintegration product of actinium | Synonyms: atomic number 87, Fr |
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| frustum | (noun) a truncated cone or pyramid; the part that is left when a cone or pyramid is cut by a plane parallel to the base and the apical part is removed | - |
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| fulcrum | (noun) the pivot about which a lever turns | - |
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| gadolinium | (noun) a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group | Synonyms: atomic number 64, Gd |
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| galbanum | (noun) a bitter aromatic gum resin that resembles asafetida | Synonyms: gum albanum |
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