Dictionary![]() ![]() e•chi•noidPronunciation: (i-kī'noid, ek'u-noid"), [key] —adj. belonging or pertaining to the class Echinoidea, comprising mainly sea urchins and sand dollars. —n. any echinoderm of the Echinoidea. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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