photogen

== English == === Alternative forms === photogene === Etymology === From photo- +‎ -gen. === Noun === photogen (plural photogens) (chemistry) A light hydrocarbon oil resembling kerosene, used as a lubricant, illuminant, etc. (biology) A microorganism that produces phosphorescence. This term needs a definition. Please help out and add a definition, then remove the text {{rfdef}}. == German == === Pronunciation === === Adjective === photogen (strong nominative masculine singular photogener, not comparable) alternative spelling of fotogen ==== Usage notes ==== The spelling photogen was deprecated in 2024 in a German spelling reform.