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equivalve

[ee-kwuh-valv] /ˈi kwəˌvælv/
adjective
1.
(of a bivalve mollusk) having the valves of the shell equal in shape and size.
Origin
1860-1865
1860-65; equi- + valve
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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