• synonyms


  1. (of a bivalve mollusk) having the valves of the shell equal in shape and size.
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Origin of equivalve

First recorded in 1860–65; equi- + valve
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for equivalve

Historical Examples

  • Shell transverse, equivalve, not affixed, the tops decorticated.

    Zoological Illustrations, Volume I

    William Swainson

  • A bivalve is said to be equivalve when the two shells composing it are of the same size, inequivalve when they are not.

  • The shells are porcelanous and translucent, equivalve, with an external ligament, and at least two cardinal teeth in each valve.

    The Sea-beach at Ebb-tide

    Augusta Foote Arnold

  • The shells are equivalve, and devoid of bright colors or striking sculptural features.

    The Sea-beach at Ebb-tide

    Augusta Foote Arnold

  • Shell bivalve, equivalve, very transversely elongated, open at both ends.