photochromic

[ foh-tuh-kroh-mik ]

adjective

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

photochromic

/ ˌfəʊtəʊˈkrəʊmɪk /

adjective

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

Other Words From

• photo·chromism noun

Word History and Origins

Origin of photochromic¹

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

Example Sentences

The Challenger doesn’t have a fan, a digital display, a magnetic lens-change system, or photochromic lenses.

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