Source : Webster's Revised Unabridged Dictionary (1913)

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