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What is the X in X-mas?

oxy-1

1.
a combining form meaning “sharp,” “acute,” “keen,” “pointed,” “acid,” used in the formation of compound words:
oxycephalic; oxygen; oxymoron.
Origin
< Greek, combining form of oxýs sharp, keen, acid

oxy-2

1.
a combining form representing oxygen, in compound words, sometimes as an equivalent of hydroxy-: oxychloride.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for oxy

oxy-1

combining form
1.
denoting something sharp; acute: oxytone
Word Origin
from Greek, from oxus

oxy-2

combining form
1.
containing or using oxygen: oxyacetylene
2.
a former equivalent of hydroxy-
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 oxy

oxy-

word-forming element meaning "sharp, pointed; acid," from Greek oxy-, comb. form of oxys "sharp, pungent" (see acrid). Also used as a comb. form of oxygen.

Online Etymology Dictionary, © 2010 Douglas Harper
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oxy in Medicine

oxy- or ox-
pref.
Oxygen, especially additional oxygen: oxygenation.

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

13
12
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