multivalve

Adjective, Noun

mul=ti=valve

CIDE DICTIONARY

multivalve, n. [Cf. F. multivalve.].

Any mollusk which has a shell composed of more than two pieces. [1913 Webster]

multivalve, a. [Multi- + valve, valvular: cf. F. multivalve.].

Having many valves. [1913 Webster]
Many-valved; having more than two valves; -- said of certain shells, as the chitons. [1913 Webster]

multivalve, n. (attrib.) (of a shell etc.) having several valves.