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etalon

[eyt-l-on] /ˈeɪt lˌɒn/
noun, Optics.
1.
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
1900-1905
1900-05; < French; Middle French estalon standard, derivative of Old French estal place < Germanic; see stall1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for etalon

etalon

/ˈɛtəˌlɒn/
noun
1.
(physics) a device used in spectroscopy to measure wavelengths by interference effects produced by multiple reflections between parallel half-silvered glass or quartz plates
Word Origin
C20: French étalon a fixed standard of weights and measures, from Old French estalon; see also stallion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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