‖n. pl. [ NL., fr. Gr. 'a priv. + &unr_; a flat cake + fe`rein to bear. ] (Zool.) A division of Amphineura in which the body is naked or covered with slender spines or setæ, but is without shelly plates. [ 1913 Webster ]
n. 1. one of the aplacophora; a deep-water wormlike mollusk lacking calcareous plates on the body but having fine limy spicules on the covering mantle. Syn. -- solenogaster [ WordNet 1.5 ]