'Cystidea' definitions:

Definition of 'Cystidea'

From: GCIDE

Cystidea \Cys*tid"e*a\ (s?s-t?d"?-?), n. pl. [NL., fr. Gr. ???? a bladder, pouch.] (Zool.) An order of Crinoidea, mostly fossils of the Paleozoic rocks. They were usually roundish or egg-shaped, and often unsymmetrical; some were sessile, others had short stems. [1913 Webster]