from
The Collaborative International Dictionary of English v.0.48
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.]