Cys*tid"e*a\ (s?s-t?d"?-?), n. pl. [NL., fr. Gr. ???? a bladder, pouch.] (Zo["o]l.) 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.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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