Medical Dictionary
photochromogen
noun pho·to·chro·mo·gen \ˌfōt-ō-ˈkrō-mə-jən\
Medical Definition of PHOTOCHROMOGEN
: 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
Seen & Heard
What made you want to look up photochromogen? Please tell us where you read or heard it (including the quote, if possible).