phot-

combining form

variants or photo-

1

: light : radiant energy

photon

photography

2

: photograph : photographic

photoengraving

3

: photoelectric

photocell

Word History

Etymology

Greek phōt-, phōto-, from phōt-, phōs — more at fancy

Kids Definition

phot-

combining form

variants or photo-

1

: light

photon

photography

2

: photograph : photographic

photocopy

3

: photoelectric

photocell

Etymology

from Greek phot-, phos "light"

Medical Definition

phot

noun

ˈfōt 

: the cgs unit of illumination equal to one lumen per square centimeter