diffraction grating, grating - 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
grate, grating - a frame of iron bars to hold a fire
grate, grating - a barrier that has parallel or crossed bars blocking a passage but admitting air
grating, gravelly, rasping, raspy, rough, scratchy - unpleasantly harsh or grating in sound
Example:- a gravelly voice