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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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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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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