| n. | 1. | The art of comparing, photometrically, the brightness of two spectra, wave length by wave length; the use of the spectrophotometer. |
| 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. |
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