horseshoe crab


Definition of horseshoe crab

  1. :  any of several closely related marine arthropods (order Xiphosura and class Merostomata) with a broad crescentic cephalothorax, six pairs of legs, and a spikelike tail; especially :  one (Limulus polyphemus) of coastal waters from Maine to the Yucatán Peninsula —called also king crab


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