{ } a. [ Equi- + valve. ] (Zoöl.) Having the valves equal in size and from, as in most bivalve shells. [ 1913 Webster ]
a. (Zoöl.) Same as Equivalve or Equivalved. [ 1913 Webster ]
{ } a. (Zool.) Having unequal valves, as the shell of an oyster. [ 1913 Webster ]