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| horseshoe crab n. 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. |
lim·u·lus (lĭm'yə-ləs) n. pl. lim·u·li (-lī, -lē) See horseshoe crab. [Latin līmulus, sidelong (from its motion), diminutive of līmus.] |