Medical Dictionary


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


How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears