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Definition of: microphotometer
(mī′krō·fō·tom′ə·tər) noun
An instrument for the measurement of very small luminous intensities, and for the comparative study of spectral lines.
—mi′cro·pho′·to·met′ric (-fō′tə·met′rik) adjective
—mi′cro·pho·tom′e·try noun
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