(of a material) having an electrical conductivity that increases with increasing illumination
photopositive in American English
(ˌfoʊtoʊˈpɑzətɪv)
adjective
Biology
responding positively to light, as a moth does
photopositive in American English
(ˌfoutəˈpɑzɪtɪv)
adjective
Physics
pertaining to a substance whose conductivity increases upon absorption of electromagnetic radiation
Word origin
[1910–15; photo- + positive]This word is first recorded in the period 1910–15. Other words that entered Englishat around the same time include: carbon cycle, grass roots, insulin, isotope, spotlightphoto- is a combining form meaning “light” (photobiology); also used to represent “photographic” or “photograph” in the formation of compoundwords. Other words that use the affix photo- include: photogenic, photography, photomultiplier, photopathy, photorealism