| eohippus | (noun) earliest horse; extinct primitive dog-sized four-toed Eocene animal | Synonyms: dawn horse |
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| eolith | (noun) a crude stone artifact (as a chipped flint); possibly the earliest tools | - |
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| eolithic | (adjective) of or relating to the earliest period of the Stone Age (characterized by the use of eoliths) | - |
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| eolotropic | (adjective) having properties with different values along different axes | Synonyms: aeolotropic |
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| eon | (noun) (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe | Synonyms: aeon |
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| (noun) an immeasurably long period of time | Synonyms: aeon |
| (noun) the longest division of geological time | Synonyms: aeon |
| eonian | (adjective) of or relating to a geological eon (longer than an era) | Synonyms: aeonian |
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| (adjective) continuing forever or indefinitely | Synonyms: aeonian, ageless, eternal, everlasting, perpetual, unceasing, unending |
| eonni | (noun) an older other woman, especially a sister, used by a female | - |
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| eoraptor | (noun) a theropod dinosaur of the genus Eoraptor | - |
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| eosin | (noun) a red fluorescent dye resulting from the action of bromine on fluorescein; used in cosmetics and as a biological stain for studying cell structures | Synonyms: bromeosin |
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| eosinopenia | (noun) a decrease in the number of eosinophils in the blood | - |
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| eosinophil | (noun) a leukocyte readily stained with eosin | Synonyms: eosinophile |
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| eosinophile | (noun) a leukocyte readily stained with eosin | Synonyms: eosinophil |
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| eosinophilia | (noun) a symptom of allergic states; increased eosinophils in the blood | - |
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| eosinophilic | (adjective) of or relating to eosinophil | - |
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