The Collaborative International Dictionary of English v.0.48:

Anodon \An"o*don\, n. [NL., fr. Gr. ? toothless; 'an priv. + ?,
   ?, a tooth.] (Zool.)
   A genus of fresh-water bivalves, having no teeth at the
   hinge. [Written also Anodonta.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Anodonta \Anodonta\ n.
   a genus of thin-shelled freshwater mussels.

   Syn: genus Anodonta.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Anodonta
    n 1: thin-shelled freshwater mussels [syn: Anodonta, genus
         Anodonta]