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horseshoe crab
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any of an order (Xiphosura, class Merostomata) of sea arthropods shaped like the base of a horse's foot and having a long, spinelike tail
See horseshoe crab in American Heritage Dictionary 4
noun
Any of various marine arthropods of the class Merostomata, especially Limulus polyphemus or Xiphosura polyphemus of eastern North America, having a large rounded body and a stiff pointed tail. Also called king crab, limulus.
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