Definition of radiolarite in US English:

radiolarite

noun

Geology
  • A type of hard, homogeneous, fine-grained siliceous sedimentary rock formed mainly from the skeletal remains of radiolarians. Also: any sedimentary rock formed mainly from radiolarians; radiolarian earth.

Origin

Early 20th century. From French radiolarite from scientific Latin Radiolaria + French -ite.

Pronunciation

radiolarite

/ˌreɪdɪə(ʊ)ˈlɛːrʌɪt/