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What is the X in X-mas?

xi

[zahy, sahy; Greek ksee] /zaɪ, saɪ; Greek ksi/
noun, plural xis.
1.
the 14th letter of the Greek alphabet (Ξ, ξ).
2.
the group of consonant sounds represented by this letter.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for xis

xi

/zaɪ; saɪ; ksaɪ; ksiː/
noun (pl) xis
1.
the 14th letter in the Greek alphabet (Ξ, ξ), a composite consonant, transliterated as x

Xi

/ʃiː/
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)
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
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Word Origin and History for xis

xi

n.

fourteenth letter of the Greek alphabet.

Online Etymology Dictionary, © 2010 Douglas Harper
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xis in Medicine

xi (zī, sī, ksē)
n.

Symbol ξ 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.
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Related Abbreviations for xis

XI

ex interest
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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10
10
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