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photo

[foh-toh] /ˈfoʊ toʊ/
noun, plural photos.
2.
Informal. photo finish.
Origin of photo
1855-1860
1855-60; shortened form of photograph

photo-

1.
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-.
Origin
< Greek, combining form of phôs (genitive phōtós)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for photo
British Dictionary definitions for photo

photo

/ˈfəʊtəʊ/
noun (pl) -tos
1.
short for photograph (sense 1)

photo-

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

1860, shortening of photograph. The verb is first recorded 1865, from the noun. Photo finish is attested from 1936. Photo opportunity first recorded 1974.

photo-

word-forming element meaning "light" or "photographic" or "photoelectric," from Greek photo-, comb. form of phos (genitive photos) "light," from PIE root *bha- "to shine" (see phantasm).

Online Etymology Dictionary, © 2010 Douglas Harper
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photo in Medicine

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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photo in Science
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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10
10
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