Definition of photochromic
1
: capable of changing color on exposure to radiant energy (such as light)
photochromic glass
2
: of, relating to, or utilizing the change of color shown by a photochromic substance
a photochromic process
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Merriam-Webster unabridged
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Time Traveler for photochromic
The first known use of photochromic was in 1881
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