WordReference Random House Learner's Dictionary of American English © 2015
ˈhorse•shoe ˈcrab, n. [countable]
Invertebratesa large marine arthropod having a brown covering curved like a horseshoe and a stiff tail.

WordReference Random House Unabridged Dictionary of American English © 2015
horseshoe crab, 
Invertebratesa large marine arthropod, Limulus polyphemus, of shallow coastal waters of eastern North America and eastern Asia, having both compound and simple eyes, book gills, a stiff tail, and a brown carapace curved like a horseshoe: a living fossil related to the woodlouse. Also called king crab. 

Collins Concise English Dictionary © HarperCollins Publishers::

horseshoe crab n
  1. any marine chelicerate arthropod of the genus Limulus, of North America and Asia, having a rounded heavily armoured body with a long pointed tail: class Merostomata
    Also called: king crab

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