• In <em>conchology</em>, having unequal valves, as a bivalve mollusk; having one of the valves larger than the other: applied both to lamelli-branch bivalves, in which the valves are lateral, and to brachiopods, in which the valves are a dorsal and a ventral one.
  • Having unequal valves, as the shell of an oyster.
  • Having <xref>valves</xref> of different sizes
  • Any bivalve mollusc whose valves are of different sizes.
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