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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Sea ur·chin Zool. Any one of numerous species of echinoderms of the order Echinoidea.
 Note: When living they are covered with movable spines which are often long and sharp.
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From: WordNet (r) 2.0

 sea urchin
      n : shallow-water echinoderms having soft bodies enclosed in
          thin spiny globular shells