opisthobranchiate

from The Collaborative International Dictionary of English v.0.48

Opisthobranchiate \O*pis`tho*bran"chi*ate\, a. (Zool.)
   Of or pertaining to the Opisthobranchiata. -- n. One of the
   Opisthobranchiata.
   [1913 Webster] Opisthocoelian