Definition of photo- combining form from the Oxford Advanced Learner's Dictionary

     

    photo-

     combining form
    combining form
    BrE BrE//ˈfəʊtəʊ//
     
    ; NAmE NAmE//ˈfoʊtoʊ//
     
    (in nouns, adjectives, verbs and adverbs)
     
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  1. 1connected with light photosynthesis
  2. 2connected with photography photogenic
  3. Word Originsense (1) from Greek phōs, phōt- ‘light’; sense (2), abbreviation of photography.
See the Oxford Advanced American Dictionary entry: photo-