WordReference Random House Learner's Dictionary of American English © 2014
ˈhorse•shoe ˈcrab, n. [countable]
a large marine arthropod having a brown covering curved like a horseshoe and a stiff tail.

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

'horseshoe crab' also found in these entries:
In the English description:

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