GNU Collaborative International Dictionary of English

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1.       
   ‖Cystidea , 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