photonegative

[ foh-tuh-neg-uh-tiv ]
/ ˌfoʊ təˈnɛg ə tɪv /

adjective Physics.

pertaining to a substance, as selenium, having a conductivity that decreases upon absorption of electromagnetic radiation.

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Origin of photonegative

First recorded in 1910–15; photo- + negative
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for photonegative

photonegative
/ (ˌfəʊtəʊˈnɛɡətɪv) /

adjective

physics (of a material) having an electrical conductivity that decreases with increasing illumination
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012