Crinoid is a marine echinoderm of the class Crinoidea, characterized by a plant-like stem and feathery arms used for filter feeding. In biology contexts, it refers to the fossil group as well as living crinoids. The term also appears in paleontology and comparative anatomy discussions, typically as a technical noun in scientific discourse. (Note: Crinoid is usually a noun; used attributively or as a subject in sentences.)
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