Source : Webster's Revised Unabridged Dictionary (1913)

Medusoid \Me*du"soid\, a. [Medusa + -oid.] (Zo["o]l.)
   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}.

Source : WordNet®

medusoid
     adj : relating to or resembling a medusa