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xi

[zahy, sahy; Greek ksee]
noun, plural xis.
  1. the 14th letter of the Greek alphabet (Ξ, ξ).
  2. the group of consonant sounds represented by this letter.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for xi

xi

noun plural xis
  1. the 14th letter in the Greek alphabet (Ξ, ξ), a composite consonant, transliterated as x
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Xi

Hsi or Si

noun
  1. 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)
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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

n.

fourteenth letter of the Greek alphabet.

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Online Etymology Dictionary, © 2010 Douglas Harper

xi in Medicine

xi

(zī, sī, ksē)
n.
  1. The 14th letter of the Greek alphabet.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.