echelette grating


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

< French échelette rack, equivalent to échelle ladder (see echelon) + -ette -ette Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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