Asterioidea

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]