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GRATING

Definition:

[noun] a barrier that has parallel or crossed bars blocking a passage but admitting air
Synonyms: grate
[noun] a frame of iron bars to hold a fire
Synonyms: grate
[noun] 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
Synonyms: diffraction
[adjective] unpleasantly harsh or grating in sound; "a gravelly voice"
Synonyms: gravel, gravelly, rasping, raspy, rough