radiolarian

noun ra·di·o·lar·i·an \ ˌrā-dē-ō-ˈler-ē-ən \

Definition of radiolarian

: any of three classes (Acantharia, Polycystina, and Phaeodaria) of usually spherical chiefly planktonic marine protozoans having radiating threadlike pseudopodia and often a siliceous skeleton of spicules

radiolarian

adjective

Recent Examples of radiolarian from the Web

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First Known Use of radiolarian

1869

in the meaning defined above

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