etalon

etalon

[eyt-l-on]
noun Optics.
an interferometer consisting of two glass plates that reflect approximately half of each ray of light incident upon them and that are separated by a small, fixed distance: used to compare wavelengths and to study atomic spectra.

Origin:
1900–05; < French; Middle French estalon standard, derivative of Old French estal place < Germanic; see stall1

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etalon (ˈɛtəˌlɒn)
 
n
physics a device used in spectroscopy to measure wavelengths by interference effects produced by multiple reflections between parallel half-silvered glass or quartz plates
 
[C20: French étalon a fixed standard of weights and measures, from Old French estalon; see also stallion]

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