GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Spectrophotometry (?), n.
   1. The art of comparing, photometrically, the brightness of two spectra, wave length by wave length; the use of the spectrophotometer.
   
   [Webster 1913 Suppl.]
   
   
   2. (Chem., Physics) the art or process of measuring the degree of absorption of light at different wavelengths by a chemical substance, by means of a spectrometer or spectrophotometer.  It is a technique for chemical analysis.
   
   [PJC]
   
    -- Spec`tro*pho`to*met"ric (#), a.
   
   [Webster 1913 Suppl.]