Source : Webster's Revised Unabridged Dictionary (1913)

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 : WordNet®

Radiolaria
     n : marine protozoa [syn: {order Radiolaria}]