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 - medusa, medusan
Derived forms: medusoids
Type of: cnidarian, coelenterate
Part of: Cnidaria, Coelenterata, phylum Cnidaria, phylum Coelenterata