spectrometer

/S P EH0 K T R AA1 M AH0 T ER0/
noun
  1. 1

    An optical instrument for measuring the absorption of light by chemical substances; typically it will plot a graph of absorption versus wavelength or frequency, and the patterns produced are used to identify the substances present, and their internal structure.

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Source: https://en.wiktionary.org/wiki/spectrometer