Rudista
plural noun
Ru·dis·ta
rüˈdistə
in some classifications
: a division of Eulamellibranchia comprising extinct chiefly Cretaceous bivalve mollusks with one valve elongate, conical, and thick-shelled and the other small and fitting like a lid on the first
rudistan adjective or noun
(ˈ)⸗¦⸗stən
rudistid adjective or noun
(ˈ)⸗¦⸗stə̇d
Word History
Etymology
New Latin, from Latin rudis rude, raw + -ista -ist