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photoluminescence
photolysis
photomap
photomask
photomechanical
photometry
photomicrograph
photomontage
photomosaic
photomultiplier
photon
photonegative
photonics
photonuclear
photoperiod
photoperiodism
photopheresis
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photopigment
pho·to·pig·ment [ ftō pígmənt ] (plural pho·to·pig·ments)


noun 
Definition:
 
light-absorbing chemical: a light-absorbing chemical that converts light into biochemical energy, e.g. in the rods and cones of the eye
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