The Collaborative International Dictionary
Unimuscular
Unimuscular \U`ni*mus"cu*lar\, a. [Uni- muscular.] (Zo["o]l.) Having only one adductor muscle, and one muscular impression on each valve, as the oyster; monomyarian.
Wiktionary
unimuscular
a. (context anatomy English) Having only one adductor muscle, and one muscular impression on each valve.