Radiolaria (rād&ibreve_;&ouptack_;lār&ibreve_;&adot_;), 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.
[1913 Webster]