I. ¦fōd.ə¦krōmik adjective
( -s )
Etymology: phot- + chrom- + -ic
1. : capable of changing color on exposure to radiant energy (as light)
photochromic glass
photochromic lenses
2. : of, relating to, or utilizing the change of color shown by a photochromic substance
a photochromic process
• pho·to·chro·mism -ˌmizəm noun
II. " noun
( -s )
: a photochromic substance — usually used in plural