medusoid adj 1: relating to or resembling a medusa n 1: 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: {medusa}, {medusoid}, {medusan}]
Medusoid \Me*du"soid\, a. [Medusa + -oid.] (Zool.) Like a medusa; having the fundamental structure of a medusa, but without a locomotive disk; -- said of the sessile gonophores of hydroids. -- n. A sessile gonophore. See Illust. under {Gonosome}. [1913 Webster]