‖n. [ NL., fr. Gr. &unr_; toothless; 'an priv. + &unr_;, &unr_;, a tooth. ] (Zool.) A genus of fresh-water bivalves, having no teeth at the hinge. [ Written also Anodonta. ] [ 1913 Webster ]

n. a genus of thin-shelled freshwater mussels.
Syn. -- genus Anodonta. [ WordNet 1.5 ]