01 n. An instrument for measuring or comparing the intensities of the colors of the spectrum.
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1.
An instrument for measuring or comparing the intensities of the colors of the spectrum.(Opt.)
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2.
An analytical instrument for measuring the degree of absorption of light at different wavelengths by a chemical substance. A specific pattern of absorption intensities at a series of wavelengths is a characteristic of each different chemical substance.(Chem., Physics)