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limulus

limulus Zool.
  (ˈlɪmjʊləs)
  Pl. -i.
  [mod.L. use of L. līmulus somewhat askance, f. līmus askew.]
  A genus of Merostomata (Order Limulidæ); the king-crab or horse-shoe crab.

1837 Buckland Geol. & Min. I. 393 A second approximation to the character of Trilobites occurs in the Limulus or King crab. 1859 Page Handbk. Geol. Terms, Limulus, the Molucca-crab, king-crab, or horse-shoe crab. 1873 Dawson Earth & Man v. 94 The Limuli, or horse-shoe crabs.

Oxford English Dictionary

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