from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The tentacled, usually bell-shaped, free-swimming sexual stage in the life cycle of a coelenterate, such as a jellyfish.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Special form that cnidarians may turn into.
Latin Medūsa, Medusa (from the Medusa's snaky locks); see Medusa.(American Heritage® Dictionary of the English Language, Fourth Edition)