Radiolaria \Ra`di*o*la"ri*a\, n. pl. [NL. See Radioli.]

(Zo["o]l.) 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.

Source: Webster's Revised Unabridged Dictionary (1913)