noun pho·to·chro·my \ˈfōtəˌkrōmē\

Definition of photochromy



  1. :  a formerly used process of color photography in which a silver chloride emulsion layer assumes approximately the color of the exposing light

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of photochromy

International Scientific Vocabulary phot- + -chromy

Seen and Heard

What made you want to look up photochromy? Please tell us where you read or heard it (including the quote, if possible).


to help become familiar with something

Get Word of the Day daily email!