[foh-tuh-poz-i-tiv] /ˌfoʊ təˈpɒz ɪ tɪv/
pertaining to a substance whose conductivity increases upon absorption of electromagnetic radiation.
(physics) (of a material) having an electrical conductivity that increases with increasing illumination
[foh-tuh-print] /ˈfoʊ təˌprɪnt/ noun 1. a photographic . 2. a made by a photomechanical process; a photocopy.
photopsia pho·top·si·a (fō-tŏp’sē-ə) n. The sensation of seeing lights, sparks, or colors caused by retinal or cerebral disease. Also called photopsy.
[foh-toh-proh-ton] /ˌfoʊ toʊˈproʊ tɒn/ noun, Physics. 1. a emitted from a nucleus during photodisintegration.
photopsin pho·top·sin (fō-tŏp’sĭn) n. The protein component of the pigment iodopsin in the cones of the retina of the eye.