fäˈsfȯrəˌgraf, -rȧf noun
Etymology: phosphor- + -graph
: a photographic impression made by laying a phosphorescent body directly upon the photographic film in order to detect phosphorescence too feeble to be observed visually
• phos·pho·ro·graph·ic |fäsfərə|grafik adjective
• phos·pho·rog·ra·phy ˌfäsfəˈrägrəfē noun -es