‖n. pl. [ NL. See Radioli. ] (Zool.) 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. [ 1913 Webster ]
a. (Zool.) Of or pertaining to the Radiolaria. --