radiolaria

plural noun
ra·​di·​o·​lar·​ia | \ˌrā-dē-ō-ˈler-ē-ə \

Definition of radiolaria 

: protozoans that are radiolarians

First Known Use of radiolaria

1868, in the meaning defined above

History and Etymology for radiolaria

New Latin, from Late Latin radiolus small sunbeam, from diminutive of Latin radius ray — more at ray

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The first known use of radiolaria was in 1868

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