\ ā-ˈshel How to pronounce echelle (audio) \

Definition of echelle

: a diffraction grating made by ruling a plane metallic mirror with lines having a relatively wide spacing

Examples of echelle in a Sentence

Recent Examples on the Web The echelle spectrograph for rocky exoplanets and stable spectroscopic observations (ESPRESSO) is an excellent tool to make these observations. Chris Lee, Ars Technica, "Fine structure constant may vary with space, constant in time," 28 Apr. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'echelle.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of echelle

1949, in the meaning defined above

History and Etymology for echelle

French, literally, ladder, from Old French eschele

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Time Traveler for echelle

Time Traveler

The first known use of echelle was in 1949

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Cite this Entry

“Echelle.” Dictionary, Merriam-Webster, Accessed 13 Aug. 2020.

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