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radiolarian (n.)

"one of the Radiolaria," a name applied by Haeckel (1862) to the protozoa called by Ehrenberg Polycystina. The classification name is Modern Latin, from Latin radiolus, diminutive of radius (q.v.), so called for the organisms' radiant "spikes."

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Definitions of radiolarian from WordNet

radiolarian (n.)
protozoa with amoeba-like bodies and radiating filamentous pseudopods;
From wordnet.princeton.edu