phosphorograph
noun
phos·phoro·graph
fäˈsfȯrəˌgraf,
-rȧf
: 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
phosphorographic
adjective
¦fäsfərə¦grafik
phosphorography
noun
ˌfäsfəˈrägrəfē
plural -es
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Merriam-Webster unabridged
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