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echelette

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

< French échelette rack, equivalent to échelle ladder (see echelon) + -ette -ette
Also called echelette grating.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018