Nudibranchiata

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Nudibranchiata \Nu`di*bran`chi*a"ta\, n. pl. [NL. See {Nude},
     and {Branchia}.] (Zool.)
     A division of opisthobranchiate mollusks, having no shell
     except while very young. The gills are naked and situated
     upon the back or sides. See {Ceratobranchia}.
     [1913 Webster]