photo-

photo-

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)

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Collins
World English Dictionary
photo-
 
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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Etymonline
Word Origin & History

photo-
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-
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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