[ zahy, sahy; Greek ksee ]
/ zaɪ, saɪ; Greek ksi /

noun, plural xis.

the 14th letter of the Greek alphabet (Ξ, ξ).
the group of consonant sounds represented by this letter.

Nearby words

  1. xerox,
  2. xerus,
  3. xerxes,
  4. xerxes i,
  5. xhosa,
  6. xi baryon,
  7. xi jiang,
  8. xi particle,
  9. xi'an,
  10. xi-c baryon

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for xi

British Dictionary definitions for xi


/ (zaɪ, saɪ, ksaɪ, ksiː) /

noun plural xis

the 14th letter in the Greek alphabet (Ξ, ξ), a composite consonant, transliterated as x


Hsi or Si

/ (ʃiː) /


a river in S China, rising in Yunnan province and flowing east to the Canton delta on the South China Sea: the main river system of S China. Length: about 1900 km (1200 miles)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for xi



fourteenth letter of the Greek alphabet.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for xi


[ zī, sī, ksē ]


The 14th letter of the Greek alphabet.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.