1. small class of marine mollusks comprising the chitons; sometimes considered an order of the subclass Amphineura; [syn: Polyplacophora, class Polyplacophora]
WordNet (r) 3.0 (2006):
class Polyplacophora
n 1: small class of marine mollusks comprising the chitons;
sometimes considered an order of the subclass Amphineura
[syn: Polyplacophora, class Polyplacophora]