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.

Origin of photochromic

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

OTHER WORDS FROM photochromic

pho·to·chro·mism, noun

Words nearby photochromic

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

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