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From The Collaborative International Dictionary of English v.0.48:
Medusa \Me*du"sa\, n. [L., fr. Gr. ?.] 1. (Class. Myth.) The Gorgon; or one of the Gorgons whose hair was changed into serpents, after which all who looked upon her were turned into stone. [1913 Webster] 2. [pl. Medusae.] (Zool.) Any free swimming acaleph; a jellyfish. [1913 Webster] Note: The larger medusae belong to the Discophora, and are sometimes called covered-eyed medusae; others, known as naked-eyed medusae, belong to the Hydroidea, and are usually developed by budding from hydroids. See Discophora, Hydroidea, and Hydromedusa. [1913 Webster] Medusa bud (Zool.), one of the buds of a hydroid, destined to develop into a gonophore or medusa. See Athecata, and Gonotheca. Medusa's head. (a) (Zool.) An astrophyton. (b) (Astron.) A cluster of stars in the constellation Perseus. It contains the bright star Algol. [1913 Webster]