Valvata

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Valvata \Val*va"ta\, n. [NL.; cf. L. valvatus having folding
     doors. See {Valve}.] (Zool.)
     A genus of small spiral fresh-water gastropods having an
     operculum.
     [1913 Webster]