Asteridea :: Asteridea (n. pl.) 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.
Asteridian :: Asteridian (a.) Of or pertaining to the Asterioidea.
Asteridian :: Asteridian (n.) A starfish; one of the Asterioidea.