• Webster's Revised Unabridged Dictionary
    • n Cystidean (Zoöl) One of the Cystidea.
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Century Dictionary and Cyclopedia
    • n cystidean A cystic crinoid; an encrinite of the order Cystidea.
    • cystidean Pertaining to or having the characters of the Cystidea.
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In literature:

A genus of Cystideans.
"The Ancient Life History of the Earth" by Henry Alleyne Nicholson
This advance is not, however, along one line for the Cystideans continue unimproved to the end.
"The Chain of Life in Geological Time" by Sir J. William Dawson