photochromic

[ foh-tuh-kroh-mik ]

/ ˌfoʊ təˈkroʊ mɪk /

adjective

(of chemically treated glass or plastic) capable of darkening or changing color when exposed to light.

Nearby words

photocell, photochemical, photochemical smog, photochemistry, photochemotherapy, photochromic, photochromic lens, photochromy, photochronograph, photocoagulation, photocoagulator

Origin of photochromic

First recorded in 1950–55; photo- + chrom- + -ic

Related forms

pho·to·chro·mism, noun

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for photochromic

photochromic

/ (ˌfəʊtəʊˈkrəʊmɪk) /

adjective

(of glass) changing colour with the intensity of incident light, used, for example, in sunglasses that darken as the sunlight becomes brighter

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