'Photogen' definitions:
Definition of 'Photogen'
From: GCIDE
- Photogen \Pho"to*gen\, n. [Photo- + -gen.] (Chem.) A light hydrocarbon oil resembling kerosene. It is obtained by distilling coal, paraffin, etc., and is used as a lubricant, illuminant, etc. [Written also photogene.] [1913 Webster]