| eider | (noun) duck of the Northern Hemisphere much valued for the fine soft down of the females | Synonyms: eider duck |
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| eiderdown | (noun) down of the eider duck | - |
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| (noun) a soft quilt usually filled with the down of the eider | Synonyms: continental quilt, duvet |
| eidetic | (adjective) of visual imagery of almost photographic accuracy | - |
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| eidos | (noun) (anthropology) the distinctive expression of the cognitive or intellectual character of a culture or a social group | - |
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| eigenvalue | (noun) (mathematics) any number such that a given square matrix minus that number times the identity matrix has a zero determinant | Synonyms: characteristic root of a square matrix, eigenvalue of a matrix, eigenvalue of a square matrix |
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| eight | (adjective) being one more than seven | Synonyms: 8, viii |
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| (noun) one of four playing cards in a deck with eight pips on the face | Synonyms: eight-spot |
| (noun) the cardinal number that is the sum of seven and one | Synonyms: 8, eighter, eighter from Decatur, octad, octet, octonary, ogdoad, VIII |
| eighteen | (adjective) being one more than seventeen | Synonyms: 18, xviii |
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| (noun) the cardinal number that is the sum of seventeen and one | Synonyms: 18, XVIII |
| eighteenth | (adjective) coming next after the seventeenth in position | Synonyms: 18th |
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| (noun) position 18 in a countable series of things | - |
| eighter | (noun) the cardinal number that is the sum of seven and one | Synonyms: 8, eight, eighter from Decatur, octad, octet, octonary, ogdoad, VIII |
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| eightfold | (adjective) having eight units or components | Synonyms: eight-fold, octuple |
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| eighth | (adjective) coming next after the seventh and just before the ninth in position | Synonyms: 8th |
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| (noun) one part in eight equal parts | Synonyms: one-eighth |
| (noun) position eight in a countable series of things | - |
| eighties | (noun) the time of life between 80 and 90 | Synonyms: mid-eighties |
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| (noun) the decade from 1980 to 1989 | Synonyms: 1980s |
| (noun) the decade from 1880 to 1889 | Synonyms: 1880s |
| eightieth | (adjective) the ordinal number of eighty in counting order | Synonyms: 80th |
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| (noun) position 80 in a countable series of things | - |
| eightpence | (noun) a coin worth eight pennies | - |
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| eightpenny | (adjective) used of nail size; 2 1/2 in or 6.4 cm long | - |
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| eightsome | (noun) a Scottish reel for eight dancers | - |
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| (noun) eight people considered as a unit | Synonyms: octet, octette |
| eightvo | (noun) the size of a book whose pages are made by folding a sheet of paper three times to form eight leaves | Synonyms: 8vo, octavo |
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| eighty | (adjective) being ten more than seventy | Synonyms: 80, fourscore, lxxx |
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| (noun) the cardinal number that is the product of ten and eight | Synonyms: 80, fourscore, LXXX |
| eimeria | (noun) parasitic on the digestive epithelium of vertebrates and higher invertebrates | Synonyms: coccidium |
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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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| eisegesis | (noun) personal interpretation of a text (especially of the Bible) using your own ideas | - |
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| eisteddfod | (noun) any of several annual Welsh festivals involving artistic competitions (especially in singing) | - |
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| either | (adverb) after a negative statement used as an intensive meaning something like `likewise' or `also' | - |
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