photogene
(ˈfəʊtədʒiːn)
[mod. f. Gr. type *ϕωτογενής light-produced: see photo- 1, -gen 2.]
1. Physiol. A visual impression (usually negative, i.e. having the complementary colours and shades) continuing after the withdrawal of the object which produced it; an after-image.
| 1864 H. Spencer Biol. §62 In youth, the visual apparatus is so quickly restored to its state of integrity, that many of these photogenes, as they are called, cannot be perceived. |
† 2. A ‘photogenic drawing’, photograph. Obs.
| 1851 Crabb Techn. Dict. 541/2 Photograph,..also called photogene,..signifying what is generated or delineated by the help of light. |