‖/mhw>, n. pl. [ NL., fr. Gr. &unr_; = &unr_; + &unr_; to close. ] (Zool.) An order of lamellibranchiate mollusks having an anterior and posterior adductor muscle, as the common clam. See Bivalve. [ 1913 Webster ]

a. (Zool.) Like or pertaining to the Dimya. -- n. One of the Dimya. [ 1913 Webster ]