medusa 
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 • Syn: medusoid, medusan • Hypernyms: coelenterate, cnidarian • Member Holonyms: Cnidaria, phylum Cnidaria, Coelenterata, phylum Coelenterata
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