noun Optics.
an optical device for measuring wavelengths, deviation of refracted rays, and angles between faces of a prism, especially an instrument (prism spectrometer) consisting of a slit through which light passes, a collimator, a prism that deviates the light, and a telescope through which the deviated light is viewed and examined.

1870–75; spectro- + -meter

spectrometric [spek-truh-me-trik] , adjective
spectrometry, noun
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World English Dictionary
spectrometer (spɛkˈtrɒmɪtə)
See also mass spectrometer any instrument for producing a spectrum, esp one in which wavelength, energy, intensity, etc, can be measured

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American Heritage
Medical Dictionary

spectrometer spec·trom·e·ter (spěk-trŏm'ĭ-tər)
A spectroscope equipped with scales for measuring wavelengths or indexes of refraction.

spec'tro·met'ric (-trə-mět'rĭk) adj.
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American Heritage
Science Dictionary
spectrometer   (spěk-trŏm'ĭ-tər)  Pronunciation Key 
A spectroscope equipped with devices for measuring the frequencies of the radiation observed by it.
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Example sentences
The colors reflect back to a spectrometer outside the patient's body.
The spectrometer then measures two qualities of the reflected rays.
The prism is the method used by the old spectrometer above to view different
  colors of light.
Then a startling finding came from the neutron spectrometer, which indicated
  significant amounts of hydrogen at the poles.
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