Horseshoe-crab meaning

Any of various marine arthropods of the order Xiphosurida, especially Limulus polyphemus of eastern North America, having a large rounded body and a stiff pointed tail.
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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.
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A type of chelicerate arthropod, of the genus Limulus, resembling a crab.
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