Webster’s Revised Unabridged Dictionary · 1913
Dimya
Dim′y·a, Dim′y·a′ri·a (·ā′rĭ·ȧ), n. pl. [NL., fr. Gr. δι- = δίς + μύειν to close.] (Zoöl.) An order of lamellibranchiate mollusks having an anterior and posterior adductor muscle, as the common clam. See Bivalve.