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1. Oxford American Dictionary

   horseshoe crab

   • IPA[ˈhôr(s)ˌSHo͞o ˌkrab]

   • n.
     a large marine arthropod with a domed horseshoe-shaped shell, a long tail-spine, and ten legs, little changed since the Devonian.

   • noun: horseshoe crab, plural noun: horseshoe crabs