sand dollar
Noun

sand dollar (plural sand dollars)

  1. Any echinoderm of the order Clypeasteroida, having a flat, disk-shaped body with the mouth in a mid-ventral position, and living in sand, on or near the surface.
    • 2001, Jennifer Hahn, Spirited Waters: Soloing South Through the Inside Passage, 2009, page 135 ↗,
      If you look carefully, a sand dollar is merely a sea urchin in flattened form.
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