Pol`y*cys*ti"na\, n. pl. [NL. See Poly-, and Cyst.] (Zo["o]l.) A division of Radiolaria including numerous minute marine species. The skeleton is composed of silica, and is often very elegant in form and sculpture. Many have been found in the fossil state.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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