D defs.my
Entry 1 sense Webster, 1913

Cystidea

/(s?s-t?d"?-?)/ · Cys·tid·e·a · IPA
01 n. pl. An order of Crinoidea, mostly fossils of the Paleozoic rocks. They were usually roundish or egg-shaped, and often unsymmetrical; some were …
  1. 1.
    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.(Zool.)