any of several classes of one-celled deep-sea protozoans with long, slender pseudopodia and a spiny, or solid but perforated, skeleton of silica
Origin of radiolarian; from Modern Latin Radiolaria ; from radiolus, diminutive of Classical Latin radius, ray (see radius): from the radiating pseudopodia
Any of various marine protozoans of the order (or phylum) Radiolaria, having rigid siliceous skeletons and spicules.
Origin of radiolarianFrom New Latin Radiolāria, order name, from Late Latin radiolus, diminutive of Latin radius, ray.
(plural radiolaria or radiolarians)