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Phosphoroscope
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Wiktionary, Creative Commons Attribution/Share-Alike License
n.
Any of several devices used to measure phosphorescence, and to distinguish it from fluorescence
the GNU version of the Collaborative International Dictionary of English
n.
An apparatus for observing the phosphorescence produced in different bodies by the action of light, and for measuring its duration.
The Century Dictionary and Cyclopedia
n.
An instrument for. measuring the duration of evanescent, phospho' resceuce in different substances.
n.
A philosophical toy consisting of glass tubes containing different phosphorescent substances and arranged in a box.