Definition of photo- in English:

photo-

Syllabification: photo-

combining form

1Relating to light: photochemical
2Relating to photography: photocomposition

Origin

sense 1 from Greek phōs, phōt- 'light'; sense 2, abbreviation of photography.

Definition of photo- in:

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Word of the day anastrophe
Pronunciation: əˈnastrəfi
noun
the inversion of the usual order of words...