Rudista

1 definition found

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

  Rudistes \Ru*dis"tes\ (r[udd]*d[i^]s"t[=e]z), n. pl. [NL., fr.
     L. rudis rough.] (Paleon.)
     An extinct order or suborder of bivalve mollusks
     characteristic of the Cretaceous period; -- called also
     {Rudista}. See Illust. under {Hippurite}.
     [1913 Webster]