from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of various thin circular echinoderms of the class Echinoidea, especially Echinarachnius parma, of coastal northern Atlantic and Pacific waters, having a covering of short movable spines.
- n. The disklike internal skeleton of a sand dollar, having five radially symmetric oblong markings and often a pattern of slotlike holes.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An echinoderm, of the order Clypeastroida, that has a flat, disk-shaped body with the mouth in a mid-ventral position, and lives in sand, on or near the surface
from the GNU version of the Collaborative International Dictionary of English
- n. any one of several species of small flat circular sea urchins, which live on sandy bottoms, especially Echinarachnius parma of the American coast.
from The Century Dictionary and Cyclopedia
- n. A flat sea-urchin, as Echinarachnius parma, or Mellita quinquefora; a cake-urchin.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. flattened disklike sea urchins that live on sandy bottoms
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