Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An arthropod of the order Xiphosura, which includes the horseshoe crab and many extinct forms.
  • adj. Of or belonging to the order Xiphosura.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any member of the order Xiphosura, including horseshoe crabs.
  • adj. Of or pertaining to the order Xiphosura.

from The Century Dictionary and Cyclopedia

  • Of or pertaining to the Xiphosura, as a horseshoe-crab.
  • n. A member of the group Xiphosura; a xiphosure.

Etymologies

From New Latin Xiphosūra, order name : Greek xiphos, sword + Greek ourā, tail.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Xiphosura. (Wiktionary)

Examples

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