Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Multivalve" Definition
noun
A multivalve mollusc.
Source: Wiktionary
Any mollusk which has a shell composed of more than two pieces.
A multivalve zoölogical shell.
Source: Century Dictionary
adjective
Having multiple valves (in any context).
Source: Wiktionary
Having many valves.
Many-valved; having more than two valves; -- said of certain shells, as the chitons.
Having many valves. formerly specifically applied.
Source: Century Dictionary
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