Meaning of echinoid

e•chi•noid

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