Webster’s Revised Unabridged Dictionary · 1913
Radiolaria
Ra′di·o·la′ri·a (rā′dĭ·ō·lā′rĭ·ȧ), n. pl. [NL. See Radioli.] (Zoöl.) Order of rhizopods, usually having a siliceous skeleton, or shell, and sometimes radiating spicules. The pseudopodia project from the body like rays. It includes the polycystines. See Polycystina.