Definition of etalon in English:


Syllabification: e·ta·lon
Pronunciation: /ˈātlˌän


  • A device consisting of two reflecting plates for producing interfering light beams.
    More example sentences
    • The change in resonance frequency of the etalon measures the change in optical-path length.
    • We specialize in very large aperture etalons with diameters up to 150 mm.
    • Our products range from simple condenser lenses to precision etalons.


early 20th century: from French étalon, literally 'standard of measurement'.

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