| epistemology | (noun) the philosophical theory of knowledge | - |
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| epistle | (noun) a specially long, formal letter | - |
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| epistrophe | (noun) repetition of the ends of two or more successive sentences, verses, etc. | Synonyms: epiphora |
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| epitaph | (noun) an inscription on a tombstone or monument in memory of the person buried there | - |
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| (noun) a summary statement of commemoration for a dead person | - |
| epitaxy | (noun) growing 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 substrate | - |
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| epithalamium | (noun) an ode honoring a bride and bridegroom | - |
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| epithelioma | (noun) a malignant tumor of the epithelial tissue | - |
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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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| epithet | (noun) descriptive word or phrase | - |
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| (noun) a defamatory or abusive word or phrase | Synonyms: name |
| epitome | (noun) a standard or typical example | Synonyms: image, paradigm, prototype |
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| (noun) a brief abstract (as of an article or book) | - |
| epitope | (noun) the site on the surface of an antigen molecule to which an antibody attaches itself | Synonyms: antigenic determinant, determinant |
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| epixylon | (noun) organisms that are attached to submerged wood surfaces in aquatic ecosystems. | - |
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| epizoan | (noun) any external parasitic organism (as fleas) | Synonyms: ectoparasite, ectozoan, ectozoon, epizoon |
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| epizoon | (noun) any external parasitic organism (as fleas) | Synonyms: ectoparasite, ectozoan, ectozoon, epizoan |
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| epoch | (noun) a period marked by distinctive character or reckoned from a fixed point or event | Synonyms: era |
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| (noun) a unit of geological time that is a subdivision of a period and is itself divided into ages | - |
| (noun) (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded | Synonyms: date of reference |
| eponym | (noun) the name derived from a person (real or imaginary) | - |
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| (noun) the person for whom something is named | - |
| eponymy | (noun) the derivation of a general name from that of a famous person | - |
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| epos | (noun) a long narrative poem telling of a hero's deeds | Synonyms: epic, epic poem, heroic poem |
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| (noun) a body of poetry that conveys the traditions of a society by treating some epic theme | - |
| epoxy | (noun) a thermosetting resin; used chiefly in strong adhesives and coatings and laminates | Synonyms: epoxy glue, epoxy resin |
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| epsilon | (noun) the 5th letter of the Greek alphabet | - |
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| eptatretus | (noun) a fossil hagfish of the genus Eptatretus | - |
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