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echelette

[ esh-uh-let, ey-shuh- ]
/ ˌɛʃ əˈlɛt, ˌeɪ ʃə- /
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noun Spectography.
a diffraction grating designed to reflect infrared radiation.
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Also called echelette grating.

Origin of echelette

<French échelette rack, equivalent to échelle ladder (see echelon) + -ette-ette
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
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