- 1east n
- [ME est, fr. OE east, L aurora dawn, Gk eos, heos; personified by Eos, the Greek goddess of dawn] : a cardinal point of the compass
- 2east adj
- directed or proceeding toward the east
- 3east adv
- to, toward, or in the east

- echidna n
- [NL, fr. L, viper, fr. Gk Echidna, half-woman and half-snake monster who ate men raw] : an oviparous spiny-coated toothless burrowing nocturnal mammal of Australia, New Zealand, and Tasmania that has a long extensile tongue and long heavy claws
- echo n
- [ultim. fr. Gk Echo, a nymph who pines away for love of Narcissus until nothing is left of her but her voice] 1 : the repetition of a sound caused by reflection of sound waves 2 : one who closely imitates or repeats another's words, ideas, or acts
- Egeria n
- [L Egeria, a nymph who advised the legendary Roman king Numa Pompilius] : a woman adviser or companion
- Elara n
- [L, the mother of Tityus in classical mythology] : a satellite of Jupiter
- Electra complex n
- [L, fr. Gk Elektra, a sister of Orestes who aids him in killing their mother Clytemnestra] : the positive libidinal feelings of a daughter to her father and hostile or jealous feelings toward her mother that may be the source of adult personality disorder when unresolved
- Elissa n
- [fr. Phoenician name, fr. Gk Dido, a mythological queen of Carthage who killed herself when abandoned by Aeneas] : a girl's given name
- elysian adj
- [L, fr. Gk Elysion, the abode of the blessed after death in classical mythology] : blissful, delightful
- Elysium n
- [fr. Gk Elysion] : paradise
- Enceladus n
- [L Enceladus, a giant thought to lie buried under Mount Etna after warring with the gods and being struck down with a great stone flung at him by Athena] : a satellite of Saturn
- Epimetheus n
- [L, a son of Iapetus and brother of Prometheus and Atlas; the husband of Pandora and father of Pyrrha] : a satellite of Saturn
- eolian adj
- [L Aeolus, god of the wind] : borne, deposited, produced, or eroded by the wind
- Eros n
- [Gk. Eros, fr. eros sexual love] 1 : the sum of life-preserving instincts that are manifested as impulses to gratify basic needs and to preserve the body and mind 2 : erotic love or desire
- erotic adj
- [Gk erotikos, fr. eros sexual love, personified by Eros] 1 : tending to arouse sexual desire 2 : strongly marked by sexual desire
- erogenous adj
- 1 : producing sexual excitement or libidinal gratification when stimulated, sexually sensitive 2 : of, relating to, or arousing sexual feelings
- Etheria n
- [L Aetheri(a) Aetheria, a daughter of Helios and Clymene who, with her sisters, was one of the Heliades] : a genus of fresh-water, bivalve mollusks, the shell of which has a pearly, bright green interior

- Europa n
- [L, a sister of Cadmus who was abducted by Zeus in the form of a bull and taken to Crete, where she bore him Rhadamanthus, Minos, and Sarpedon] : one of the moons of Jupiter
- Euterpean adj
- [L, fr. Gk Euterpe, Greek Muse of music] : pleasing
