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Definition of: radiolarian
(rā′dē·ō·lâr′ē·ən) noun
Any member of an order (Radiolaria, class Sarcodina) of marine protozoans having typically a siliceous skeleton enclosing a perforated membrane.
—adjective Of or pertaining to the Radiolaria [<NL Radiolaria, name of the order <radiolus, dim. of L radius ray]
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