plural noun
Cys·​toid·​ea | \siˈstȯidēə\

Definition of Cystoidea 

: a class of Paleozoic short-stemmed or stemless pelmatozoan echinoderms formerly considered an order of Crinoidea having the body commonly somewhat globular or egg-shaped and enclosed in calcareous plates that are usually pierced by a system of pores possibly respiratory in function

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History and Etymology for Cystoidea

New Latin, from cyst- + -oidea

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to clear from alleged fault or guilt

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