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
Keep scrolling for more
Keep scrolling for more
Keep scrolling for more
Test Your Vocabulary
Slippery Words Quiz—Changing with the Times
- What is an earlier meaning of nice?

Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
Slippery Words Quiz—Changing with the Times
Do you know these earlier meanings of words?
Take the quizWords of Snow and Ice Quiz
A selection of words from the chillier parts of t...
Take the quizSpell It
Can you spell these 10 commonly misspelled words?
Take the quizWord Winder's CrossWinder Play the game
Share photochromic
Time Traveler for photochromic
The first known use of photochromic was in 1881
See more words from the same year