echelette

[esh-uh-let, ey-shuh-]

noun Spectography.

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. 2012.
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Echelette is always a great word to know.

So is ort. Does it mean:

a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

a scrap or morsel of food left at a meal.

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ech·e·lette