pho·to·sen·si·tize [ ftō sénssi tz ](past and past participlepho·to·sen·si·tized, present participlepho·to·sen·si·tiz·ing, 3rd person present singularpho·to·sen·si·tiz·es)
transitive verb
Definition:
make something sensitive to light: to increase the sensitivity of an organism or substance to electromagnetic radiation, especially visible light