The scientific measurement and analysis of fluorescence, the light emitted by substances when excited by other light.
From fluorimeter + -ry (noun suffix indicating field or practice). Combines fluorescence (from Latin 'fluere' and -escence) with -metry (measurement).
Fluorimetry became important in the 20th century because it's incredibly precise—scientists can measure fluorescence in parts per trillion, making it one of the most sensitive analytical methods available for detecting substances in tiny amounts.
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