photochemistry
noun
pho·to·chem·is·try ˌfō-tō-ˈke-mə-strē 
1
: a branch of chemistry that deals with the effect of radiant energy in producing chemical changes
2
a
: photochemical properties
the photochemistry of gases
b
: photochemical processes
photochemistry of vision
photochemist
ˌfō-tō-ˈke-mist
noun 
Word History
First Known Use
1860, in the meaning defined at sense 1
Medical Definition
photochemistry
noun
pho·to·chem·is·try -ˈkem-ə-strē
plural photochemistries
1
: a branch of chemistry that deals with the effect of radiant energy in producing chemical changes
2
a
: photochemical properties
the photochemistry of gases
b
: photochemical processes
the photochemistry of vision