noun, plural photos.
Informal. photo finish.

1855–60; shortened form of photograph Unabridged


a combining form meaning “light” (photobiology ); also used to represent “photographic” or “photograph” in the formation of compound words: photocopy.
Also, especially before a vowel, phot-.

< Greek, combining form of phôs (genitive phōtós) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
photo (ˈfəʊtəʊ)
n , pl -tos
short for photograph

combining form
1.  of, relating to, or produced by light: photosynthesis
2.  indicating a photographic process: photolithography
[from Greek phōs, phōt- light]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1860, shortening of photograph. The verb is first recorded 1868, from the noun. Photo finish is attested from 1936. Photo opportunity first recorded 1974.

comb. form meaning "light" or "photographic," from Gk. photo-, comb. form of phos (gen. photos) "light," from PIE base *bha- "to shine" (see phantasm).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

photo- or phot-

  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
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
Its green banners could be seen above photo shops everywhere.
Zoom in on a spectacular national park photo to reveal hundreds more photos
  making up the original.
When you see the right side of the left photo next to the left side of the
  right photo, it looks lopsided in comparison.
Our next semimonthly photo contest will be self-portraits.
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