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Definition of photo- combining form from the Oxford Advanced American Dictionary

     

    photo-

     combining form
    combining form
    NAmE//ˈfoʊt̮oʊ//
     
    , NAmE//ˈfoʊt̮ə//
     
    (in nouns, adjectives, verbs, and adverbs)
     
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  1. 1connected with light photosynthesis
  2. 2connected with photography photogenic
See photo- in the Oxford Advanced Learner's Dictionary