radiolitid
/ˌreɪdɪə(ʊ)ˈlʌɪtɪd/Palaeontology
noun
A rudist bivalve mollusc of the Cretaceous family Radiolitidae.
adjective
Of or relating to the family Radiolitidae; characterized by fossils of this family.
Origin
Early 20th century; earliest use found in Archibald Geikie (1835–1924), geologist and historian. From scientific Latin Radiolites, genus name + -id, after scientific Latin Radiolitidae, family name (attributed to J.E. Gray 1848, but his use has not been traced).