Definition of "photo-" [pho•to-]

• Light; radiant energy: photosynthesis. (prefix)
• Photographic: photomontage. (prefix)
• Photoelectric: photoemission. (prefix)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Note to future photo- booth users: Surprisingly these images come out pretty well, especially if you choose the black-and-white option."
• "Some companies are mining photo- and video-gathering sites using facial-recognition software."
• "Douglas Foreman photo: H.M.C.S Saskatchewan- same class as HMCS Nanaimo w/ others - Looking forward ride the sister ship in photo- Empire Days Celebration!"