photo

[foh-toh]
noun, plural photos.
2.
Informal. photo finish.

Origin:
1855–60; shortened form of photograph

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
photo (ˈfəʊtəʊ)
 
n , pl -tos
short for photograph

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

photo
1860, shortening of photograph. The verb is first recorded 1868, from the noun. Photo finish is attested from 1936. Photo opportunity first recorded 1974.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

photo- or phot-
pref.

  1. Light; radiant energy: photosynthesis.

  2. Photographic: photofluorography.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
photo-  
A prefix that means "light," as in photoreceptor.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It provides a way to share updates, photos, and recommendations with friends
  and colleagues.
Many shared photos and stories with me, and some showed me their physical scars.
Other users can discover them based on this information as well as by browsing
  the photos.
So, the president has decided not to show the photos.
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