Radiolaria /(rā`dĭ*ō̇*lā"rĭ*ȧ)/

Ra·di·o·la·ri·a

Radiolaria

n. pl.
  1. 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. (Zool.)