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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
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First Known Use of RADIOLARIAN
1875
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