Pronunciation: ā - ' shel
Function: noun
Etymology: F, literally, ladder, from Old French eschele
Date: 1949
: a diffraction grating made by ruling a plane metallic mirror with lines having a relatively wide spacing
ECHELLE
Meaning of ECHELLE in English
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012