'Spectrophotometry' definitions:

Definition of 'Spectrophotometry'

From: GCIDE

Spectrophotometry \Spec`tro*pho*tom"e*try\, 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.]