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photochromic

[foh-tuh-kroh-mik] /ˌfoʊ təˈkroʊ mɪk/
adjective
1.
(of chemically treated glass or plastic) capable of darkening or changing color when exposed to light.
Origin
1950-1955
1950-55; photo- + chrom- + -ic
Related forms
photochromism, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for photo chromic

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
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
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10
10
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