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Grating

Definition

[n] optical device consisting of a surface with many parallel grooves in it; disperses a beam of light (or other electromagnetic radiation) into its wavelengths to produce its spectrum
[n] a frame of iron bars to hold a fire
[n] a barrier that has parallel or crossed bars blocking a passage but admitting air
[adj] unpleasantly harsh or grating in sound; "a gravelly voice"

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