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18.191.171.121

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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Ark shell Zool. A marine bivalve shell belonging to the genus Arca and its allies.
 

From: WordNet (r) 2.0

 ark shell
      n : marine bivalve mollusk having a heavy toothed shell with a
          deep boat-like inner surface