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From: WordNet (r) 2.0

 Xiphosurus polyphemus
      n : large marine arthropod of the Atlantic coast of North
          America having a domed carapace that is shaped like a
          horseshoe and a stiff pointed tail; a living fossil
          related to the wood louse [syn: horseshoe crab, king
          crab, Limulus polyphemus]