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photo-
Pronunciation: /ˈfəʊtəʊ/

Definition of photo- in English:

combiningForm

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

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 doofus
Pronunciation: ˈduːfʌs
noun
a stupid person