n. [ Cf. F. multivalve. ] (Zool.) Any mollusk which has a shell composed of more than two pieces. [ 1913 Webster ]

{ } a. [ Multi- + valve, valvular: cf. F. multivalve. ] 1. Having many valves. [ 1913 Webster ]

2. (Zool.) Many-valved; having more than two valves; -- said of certain shells, as the chitons. [ 1913 Webster ]