(noun) (Greek mythology) a woman transformed into a Gorgon by Athena; she was slain by Perseus.
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Noun Definition 1
(noun) one of two forms that coelenterates take: it is the free-swimming sexual phase in the life cycle of a coelenterate; in this phase it has a gelatinous umbrella-shaped body and tentacles. Synonyms: medusa, medusoid, medusan.