'Radiolarian' definitions:

Definition of 'radiolarian'

(from WordNet)
noun
Protozoa with amoeba-like bodies and radiating filamentous pseudopods

Definition of 'Radiolarian'

From: GCIDE
  • Radiolarian \Ra`di*o*la"ri*an\ (r[=a]`d[i^]*[-o]*l[=a]"r[i^]*an), a. (Zool.) Of or pertaining to the Radiolaria. -- n. One of the Radiolaria. [1913 Webster]