combining form
or photo-
Etymology: Greek phōt-, phōto-, from phōt-, phōs — more at fancy
1. : light
phot eolic
phot on
photo graphy
photo period
2. : photograph : photographic
photo finish
photo album
photo film
3. : photoelectric
photo cell
photo current
4. : photon
photo meson
5. : photochemical
photo chlorination
photo product