: 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 WebThe echelle spectrograph for rocky exoplanets and stable spectroscopic observations (ESPRESSO) is an excellent tool to make these observations.
Chris Lee, Ars Technica, 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.