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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 As·ta·cus n.  Zool. A genus of crustaceans, containing the crawfish of fresh-water lobster of Europe, and allied species of western North America. See Crawfish.
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From: WordNet (r) 2.0

 Astacus
      n : type genus of the family Astacidae; Old World crayfish [syn:
           genus Astacus]