pho·​to·​pig·​ment ˈfōt-ō-ˌpig-mənt How to pronounce photopigment (audio)
: a pigment (as chlorophyll or a compound in the retina) that undergoes a physical or chemical change under the action of light

Dictionary Entries Near photopigment

Cite this Entry

“Photopigment.” Medical Dictionary, Merriam-Webster, Accessed 1 Feb. 2023.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

The Great British Vocabulary Quiz

  • union jack speech bubble
  • Named after Sir Robert Peel, what are British police called?
Name That Thing

You know what it looks like… but what is it called?

Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?