Rudistes
Pronunciation : Ru*dis"tes
Part of Speech : n.
Etymology : [NL., fr. L. rudis rough.] (Paleon.)
Definition : Defn: An extinct order or suborder of bivalve mollusks characteristic of the Cretaceous period; -- called also Rudista. See Illust. under Hippurite.
pl.
Source : Webster's Unabridged Dictionary, 1913