an instrument for making photometric comparisons between parts of spectra.

1880–85; spectro- + photometer

spectrophotometric [spek-troh-foh-tuh-me-trik] , adjective
spectrophotometrically, adverb
spectrophotometry, noun
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World English Dictionary
spectrophotometer (ˌspɛktrəʊfəʊˈtɒmɪtə)
See also spectrometer an instrument for producing or recording a spectrum and measuring the photometric intensity of each wavelength present, esp such an instrument used for infrared, visible, and ultraviolet radiation
[C19: from spectro- + photo- + -meter]

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American Heritage
Medical Dictionary

spectrophotometer spec·tro·pho·tom·e·ter (spěk'trō-fō-tŏm'ĭ-tər)
An instrument for measuring the intensity of light of a definite wavelength transmitted by a substance or a solution, thus providing a measure of the amount of material in the solution absorbing the light.

spec'tro·pho'to·met'ric (-fō'tə-mět'rĭk) adj.
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Example sentences for spectrophotometry
Caesium is also used as an internal standard in spectrophotometry.
Colorimetric equipment is similar to that used in spectrophotometry.
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