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echelette

[esh-uh-let, ey-shuh-] /ˌɛʃ əˈlɛt, ˌeɪ ʃə-/
noun, Spectography.
1.
a diffraction grating designed to reflect infrared radiation.
Also called echelette grating.
Origin
< French échelette rack, equivalent to échelle ladder (see echelon) + -ette -ette
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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