plural noun Cri·noi·dea \krə̇ˈnȯidēə, -rīˈ-\

Definition of Crinoidea

  1. :  a large class of chiefly tropical or fossil echinoderms that have a more or less cup-shaped body provided with five or more feathery arms commonly bifurcated or many-branched and bearing pinnules, a mouth lying between the arms on the concave upper surface, and opposite the mouth usually a long jointed stalk fixed to the base of the body and having its opposite end divided into rhizoid processes that anchor the animal to the sea bottom — compare comatulid, sea lily


\krə̇ˈnȯidēən, (ˈ)krī¦-\ adjective or noun

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Origin and Etymology of crinoidea

New Latin, from Greek krinon lily + New Latin -oidea

First Known Use: 1821

Seen and Heard

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a rounded knoll or a ridge of ice

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