asterioidea
As*te`ri*oid"e*a, As`ter*id"e*a, n. pl. Etym: [NL., fr. Gr. -oid. See Asterias.] (Zoöl.) Defn: A class of Echinodermata including the true starfishes. The rays vary in number and always have ambulacral grooves below. The body is starshaped or pentagonal.