photopigment
noun
pho·to·pig·ment
ˈfōt-ō-ˌpig-mənt 
: a pigment (as chlorophyll or a compound in the retina) that undergoes a physical or chemical change under the action of light
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“Photopigment.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/photopigment. Accessed 26 Dec. 2024.
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