( n. pl. )
An extinct order or suborder of bivalve mollusks characteristic of the Cretaceous period; -- called also Rudista. See Illust. under Hippurite.
( n. pl. )
An extinct order or suborder of bivalve mollusks characteristic of the Cretaceous period; -- called also Rudista. See Illust. under Hippurite.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012