Definify.com

Webster 1913 Edition

Noun.

[

Photo-

-logy

: cf. F.

photologie

The doctrine or science of light, explaining its nature and phenomena; optics.

[Obsolescent]

Noun.

[Gr. light, and discourse.] The doctrine or science of light, explaining its nature and phenomena.

photology ‎(uncountable)

A branch of physics that deals with light or the study of light and its effects.
That science concerned with the production of light and energy, especially regarding therapeutic applications.