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an instrument for measuring the duration of phosphorescence after the source of radiation causing it has been removed
phosphoroscope
an instrument for measuring the duration of phosphorescence after the source of radiation causing it has been removed
phosphoroscopes
PHOSPHOROSCOPE, an instrument for measuring the duration of phosphorescence after the source of radiation causing it has been removed
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a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.