Etymology
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spectrometer (n.)

1863, from German Spectrometer (Moritz Meyerstein, 1863); see spectro- + -meter.

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Definitions of spectrometer

spectrometer (n.)
spectroscope for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer;
Synonyms: mass spectrometer
From wordnet.princeton.edu