Hypertext Webster Gateway: "Asterioidea"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Asterioidea \As*te`ri*oid"e*a\, Asteridea \As`ter*id"e*a\, n.
pl. [NL., fr. Gr. 'asteri`as + -oid. See {Asterias}.]
(Zo["o]l.)
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.
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