designating or of a class (Crinoidea) of echinoderms, some of which are flowerlike in form and are anchored by a stalk, others of which are free-swimming
noun
an animal of this class, as a sea lily or feather star
See crinoid in American Heritage Dictionary 4
(krīˈnoidˌ)
noun
Any of various echinoderms of the class Crinoidea, including the sea lilies and feather stars, that are characterized by a cup-shaped body, feathery radiating arms, and either a stalk or clawlike structure with which they are able to attach to a surface.