What is the meaning of Photo-?

A combining form from Gr. fw^s, fwto`s, light; as, photography, phototype, photometer.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). photo-. Retrieved September 30, 2026, from http://smartdefine.org/photo-/definitions/2044931
ChicagoWebster's. 2011. "photo-" http://smartdefine.org/photo-/definitions/2044931 (accessed September 30, 2026).
HarvardWebster's 2011, photo-, Smart Define, viewed 30 September, 2026, <http://smartdefine.org/photo-/definitions/2044931>.
MLAWebster's. "photo-" 27 May 2011. Web. 30 September 2026. <http://smartdefine.org/photo-/definitions/2044931>