‖n. pl. [ NL., fr. Gr. &unr_; a dam, a bridge. ] (Zool.) An order of marine Annelida, in which the body is imperfectly, or not at all, annulated externally, and is mostly without setæ. [ 1913 Webster ]
a. (Zool.) Belonging to the Gephyrea. -- n. One of the Gerphyrea. [ 1913 Webster ]