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Monomya
Monomya Mo*no"my*a, Monomyaria Mon`o*my*a"ri*a, n.pl. [NL.,
fr. Gr. ? single + ?, ?, muscle.] (Zo["o]l.)
An order of lamellibranchs having but one muscle for closing
the shell, as the oyster.
Meaning of Monomya from wikipedia