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Glossary · Nouns · E

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TermTypeDefinitionClassificationsUpdated
Epiphenomenonnouna secondary phenomenon that is a by-product of another phenomenonverifiedMay 18, 2026
Epiphoranounrepetition of the ends of two or more successive sentences, verses, etc.verifiedMay 18, 2026
Epiphyllumnounany cactus of the genus Epiphyllum having flattened jointed irregularly branching stems and showy tubular flowersverifiedMay 18, 2026
Epiphysisnouna small endocrine gland in the brainverifiedMay 18, 2026
Epiphysis CerebrinounMWEa small endocrine gland in the brainverifiedMay 18, 2026
Epiphytenounplant that derives moisture and nutrients from the air and rainverifiedMay 18, 2026
Epiphytic PlantnounMWEplant that derives moisture and nutrients from the air and rainverifiedMay 18, 2026
Epiplexisnouna rhetorical device in which the speaker reproaches the audience in order to incite or convince themverifiedMay 18, 2026
Episcianounany plant of the genus EpisciaverifiedMay 18, 2026
Episcleral VeinsnounMWEsmall veins in the sclera near the corneal marginverifiedMay 18, 2026
Episcleritisnouninflammation of the sclera of the eyeverifiedMay 18, 2026
Episcopacynounthe collective body of bishopsverifiedMay 18, 2026
Episcopatenounthe territorial jurisdiction of a bishopverifiedMay 18, 2026
Episiotomynounsurgical incision of the perineum to enlarge the vagina and so facilitate delivery during childbirthverifiedMay 18, 2026
Episodenounfilm consisting of a succession of related shots that develop a given subject in a movieverifiedMay 18, 2026
Episodic MemorynounMWEmemory for episodes in your own lifeverifiedMay 18, 2026
EpisomenounDNA that is not incorporated into the genome but is replicated together with the genome (especially in bacterial cells)verifiedMay 18, 2026
Epispadiasnouna congenital abnormality in males in which the urethra is on the upper surface of the penisverifiedMay 18, 2026
Epispermnounprotective outer layer of seeds of flowering plantsverifiedMay 18, 2026
Epistasisnounthe suppression of a gene by the effect of an unrelated geneverifiedMay 18, 2026
Epistaxisnounbleeding from the noseverifiedMay 18, 2026
Epistemenounthe body of ideas that determine the knowledge that is intellectually certain at any particular timeverifiedMay 18, 2026
Epistemic LogicnounMWEthe modal logic of knowledge and uncertainty and ignoranceverifiedMay 18, 2026
Epistemologistnouna specialist in epistemologyverifiedMay 18, 2026
Epistemologynounthe philosophical theory of knowledgeverifiedMay 18, 2026
Epistlenouna specially long, formal letterverifiedMay 18, 2026
Epistrophenounrepetition of the ends of two or more successive sentences, verses, etc.verifiedMay 18, 2026
Epitaphnounan inscription on a tombstone or monument in memory of the person buried thereverifiedMay 18, 2026
Epitaxynoungrowing a crystal layer of one mineral on the crystal base of another mineral in such a manner that its crystalline orientation is the same as that of the substrateverifiedMay 18, 2026
Epithalamiumnounan ode honoring a bride and bridegroomverifiedMay 18, 2026
Epithelial CellnounMWEone of the closely packed cells forming the epitheliumverifiedMay 18, 2026
Epithelial DuctnounMWEa bodily passage or tube lined with epithelial cells and conveying a secretion or other substanceverifiedMay 18, 2026
Epithelial TissuenounMWEmembranous tissue covering internal organs and other internal surfaces of the bodyverifiedMay 18, 2026
Epitheliomanouna malignant tumor of the epithelial tissueverifiedMay 18, 2026
Epitheliumnounmembranous tissue covering internal organs and other internal surfaces of the bodyverifiedMay 18, 2026
Epithetnouna defamatory or abusive word or phraseverifiedMay 18, 2026
Epitomenouna brief abstract (as of an article or book)verifiedMay 18, 2026
Epitopenounthe site on the surface of an antigen molecule to which an antibody attaches itselfverifiedMay 18, 2026
Epitrochoidal EnginenounMWEa rotary engine that is a four-stroke internal-combustion engine without reciprocating partsverifiedMay 18, 2026
Epizoonnounany external parasitic organism (as fleas)verifiedMay 18, 2026
Epochnoun(astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recordedverifiedMay 18, 2026
Eponymnounthe name derived from a person (real or imaginary)verifiedMay 18, 2026
Eponymynounthe derivation of a general name from that of a famous personverifiedMay 18, 2026
Eposnouna body of poetry that conveys the traditions of a society by treating some epic themeverifiedMay 18, 2026
Epoxy GluenounMWEa thermosetting resinverifiedMay 18, 2026
Epoxy ResinnounMWEa thermosetting resinverifiedMay 18, 2026
Epsilonnounthe 5th letter of the Greek alphabetverifiedMay 18, 2026
Epsilon ToxinnounMWEa bacterial toxin produced by clostridium perfringensverifiedMay 18, 2026
Eptatretusnouna fossil hagfish of the genus EptatretusverifiedMay 18, 2026
Eqnounthe atomic weight of an element that has the same combining capacity as a given weight of another elementverifiedMay 18, 2026
Equal OpportunitynounMWEthe right to equivalent opportunities for employment regardless of race or color or sex or national originverifiedMay 18, 2026
Equal Protection of the LawsnounMWEa right guaranteed by the Fourteenth Amendment to the US Constitution and by the due-process clause of the Fifth AmendmentverifiedMay 18, 2026
Equal SignnounMWEa sign indicating that the quantities on either side are equalverifiedMay 18, 2026
Equal TemperamentnounMWEthe division of the scale based on an octave that is divided into twelve exactly equal semitonesverifiedMay 18, 2026
Equal-Area Map ProjectionnounMWEa map projection in which quadrilaterals formed by meridians and parallels have an area on the map proportional to their area on the globeverifiedMay 18, 2026
Equal-Area ProjectionnounMWEa map projection in which quadrilaterals formed by meridians and parallels have an area on the map proportional to their area on the globeverifiedMay 18, 2026
Equalisationnounthe act of making equal or uniformverifiedMay 18, 2026
Equalisernounelectronic equipment that reduces frequency distortionverifiedMay 18, 2026
Equalitariannouna person who believes in the equality of all peopleverifiedMay 18, 2026
Equalitarianismnounthe doctrine of the equality of mankind and the desirability of political and economic and social equalityverifiedMay 18, 2026
Equalitynounthe quality of being the same in quantity or measure or value or statusverifiedMay 18, 2026
Equality Before the LawnounMWEthe right to equal protection of the lawsverifiedMay 18, 2026
Equality of OddsnounMWEThe probability of a person in the positive class being correctly assigned a positive outcome and the probability of a person in a negative class being incorrectly assigned a positive outcome should both be the same for the protected and unprotected group members. In other words, the protected and unprotected groups should have equal rates for true positives and false positives.RequirementMay 18, 2026
Equality of OpportunitynounMWEThe probability of a person in positive class being assigned to a positive outcome should be equal for both protected and unprotected group members. In other words, the protected and unprotected groups should have equal true positive rates.RequirementMay 18, 2026
Equalizationnounthe act of making equal or uniformverifiedMay 18, 2026
Equalizernounelectronic equipment that reduces frequency distortionverifiedMay 18, 2026
Equalizing DividendnounMWEa dividend paid to compensate shareholders for losses resulting from a change in the dividend scheduleverifiedMay 18, 2026
Equanimitynounsteadiness of mind under stressverifiedMay 18, 2026
Equatabilitynouncapability of being equatedverifiedMay 18, 2026
Equatingnounthe act of regarding as equalverifiedMay 18, 2026
Equationnouna mathematical statement that two expressions are equalverifiedMay 18, 2026
Equatornounan imaginary line around the Earth forming the great circle that is equidistant from the north and south polesverifiedMay 18, 2026
Equatorial CurrentnounMWEany of the ocean currents that flow westward at the equatorverifiedMay 18, 2026
Equerrynounan official charged with the care of the horses of princes or noblesverifiedMay 18, 2026
Equestrian SportnounMWEa sport that tests horsemanshipverifiedMay 18, 2026
Equiangular TrianglenounMWEa three-sided regular polygonverifiedMay 18, 2026
Equidnounhoofed mammals having slender legs and a flat coat with a narrow mane along the back of the neckverifiedMay 18, 2026
Equidistributionnouna flat distribution having equal frequencies of occurrenceverifiedMay 18, 2026
Equilateral TrianglenounMWEa three-sided regular polygonverifiedMay 18, 2026
Equilibrationnounstabilization by bringing into equilibriumverifiedMay 18, 2026
Equilibriumnouna sensory system located in structures of the inner ear that registers the orientation of the headverifiedMay 18, 2026
Equilibrium ConstantnounMWE(chemistry) the ratio of concentrations when equilibrium is reached in a reversible reaction (when the rate of the forward reaction equals the rate of the reverse reaction)verifiedMay 18, 2026
Equilibrium LawnounMWE(chemistry) the principle that (at chemical equilibrium) in a reversible reaction the ratio of the rate of the forward reaction to the rate of the reverse reaction is a constant for that reactionverifiedMay 18, 2026
Equine DistempernounMWEan acute bacterial disease of horses characterized by inflammation of the mucous membranesverifiedMay 18, 2026
Equine EncephalitisnounMWEencephalitis caused by a virus that is transmitted by a mosquito from an infected horseverifiedMay 18, 2026
Equine EncephalomyelitisnounMWEencephalitis caused by a virus that is transmitted by a mosquito from an infected horseverifiedMay 18, 2026
Equinoctial CirclenounMWEthe great circle on the celestial sphere midway between the celestial polesverifiedMay 18, 2026
Equinoctial LinenounMWEthe great circle on the celestial sphere midway between the celestial polesverifiedMay 18, 2026
Equinoctial PointnounMWE(astronomy) either of the two celestial points at which the celestial equator intersects the eclipticverifiedMay 18, 2026
Equinoctial StormnounMWEa violent rainstorm near the time of an equinoxverifiedMay 18, 2026
Equinoctial YearnounMWEthe time for the earth to make one revolution around the sun, measured between two vernal equinoxesverifiedMay 18, 2026
Equinoxnouneither of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal lengthverifiedMay 18, 2026
Equipagenouna vehicle with wheels drawn by one or more horsesverifiedMay 18, 2026
equipmentnounThe necessary items for a particular purpose.PhysicalMay 9, 2026
Equipment CasualtynounMWEloss of military equipmentverifiedMay 18, 2026
Equipment FailurenounMWEa cessation of normal operationverifiedMay 18, 2026
Equipoisenounequality of distributionverifiedMay 18, 2026
Equippingnounthe act of equiping with weapons in preparation for warverifiedMay 18, 2026
Equitationnounthe sport of siting on the back of a horse while controlling its movementsverifiedMay 18, 2026
Equitynounthe difference between the market value of a property and the claims held against itverifiedMay 18, 2026