Monomya

{ ‖Mo‐no″my‐a (?), ‖Mon′o‐my‐a″ri‐a (?), } n. pl. [NL., fr. Gr. μόνοσ single + �, �, muscle.] (Zoöl.) An order of lamellibranchs having but one muscle for closing the shell, as the oyster.