1 definition found From The Collaborative International Dictionary of English v.0.48 [gcide]: Asterioidea \As*te`ri*oid"e*a\, Asteridea \As`ter*id"e*a\, n. pl. [NL., fr. Gr. 'asteri`as + -oid. See {Asterias}.] (Zool.) A class of Echinodermata including the true starfishes. The rays vary in number and always have ambulacral grooves below. The body is star-shaped or pentagonal. [1913 Webster]
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