photopositive

[ foh-tuh-poz-i-tiv ]
/ ˌfoʊ təˈpɒz ɪ tɪv /

adjective Physics.

pertaining to a substance whose conductivity increases upon absorption of electromagnetic radiation.

Origin of photopositive

First recorded in 1910–15; photo- + positive

British Dictionary definitions for photopositive

photopositive
/ (ˌfəʊtəʊˈpɒzɪtɪv) /

adjective

physics (of a material) having an electrical conductivity that increases with increasing illumination