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Definition of photo- - 4 dictionary results

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:
< Gk, comb. form of phôs (gen. phōtós)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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photo- or phot-  
pref.  
  1. Light; radiant energy: photosynthesis.

  2. Photographic: photomontage.

  3. Photoelectric: photoemission.


[Greek phōto-, from phōs, phōt-; see bhā-1 in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

photo- 
comb. form meaning "light" or "photographic," from Gk. photo-, comb. form of phos (gen. photos) "light" (see phosphorous.
Online Etymology Dictionary, © 2001 Douglas Harper
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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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