echelle

noun
\ā-ˈshel \

Definition of echelle 

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

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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Dictionary Entries near echelle

eche

echelette

Echelidae

echelle

echelon

echelonment

echeneid

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The first known use of echelle was in 1949

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