erbium
- n a trivalent metallic element of the rare earth group; occurs with yttrium
erebus
- n (Greek mythology) Greek god of darkness who dwelt in the underworld; son of Chaos; brother of Nox; father of Aether and Day
erechtites hieracifolia
- n an American weedy plant with small white or greenish flowers
erect bugle
- n upright rhizomatous perennial with bright blue flowers; southern Europe
erectile dysfunction
- n impotence resulting from a man's inability to have or maintain an erection of his penis
erectile tissue
- n vascular tissue capable of filling with blood and becoming rigid