Definitions

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

  • n. The 14th letter of the Greek alphabet. See Table at alphabet.
  • n. See xi baryon.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The name for the 14th letter of Classical and Modern Greek. The 15th in Ancient and Old Greek.
  • n. Either of a pair of hyperons having spin 1/2, which decay into a lambda particle and a pion.

from The Century Dictionary and Cyclopedia

  • n. The Greek letter Ξ, ξ, corresponding to the English x.
  • n. The Greek letter Ξ, ξ, corresponding to the English x and z.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. being one more than ten
  • n. the cardinal number that is the sum of ten and one
  • n. the 14th letter of the Greek alphabet

Etymologies

Greek xei, xī.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek ξεῖ, ξῖ. (Wiktionary)

Examples

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  • The American Heritage® Stedman's Medical Dictionary

    September 29, 2010