etalon
Definition of etalon
-s
: an interferometer in which two parallel partially silvered glass plates at a fixed distance apart produce by multiple reflection interference spectra of high dispersion and resolution adapted to the fine-structure analysis of spectrum lines
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Origin and Etymology of etalon
French étalon standard of weights and measures, from Middle French estalon, estelon, probably of Germanic origin; akin to Frisian stal shape, form
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