Photogen(n.) A light hydrocarbon oil resembling kerosene. It is obtained by distilling coal, paraffin, etc., and is used as a lubricant, illuminant, etc.
Photogene(n.) A photograph.
Photogene(n.) A more or less continued impression or image on the retina.
Photogenic(a.) Of or pertaining to photogeny; producing or generating light.

Words within photogenically