photochromogen
noun
pho·to·chro·mo·gen
ˌfōt-ō-ˈkrō-mə-jən 
: a microorganism especially of the genus Mycobacterium (as M. kansasii) that has little or no pigment when grown in the dark but becomes highly pigmented when grown in light
Cite this Entry
“Photochromogen.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/photochromogen. Accessed 3 Dec. 2025.
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