noun. ['ˈgreɪtɪŋ'] a barrier that has parallel or crossed bars blocking a passage but admitting air.
adjective. ['ˈgreɪtɪŋ'] unpleasantly harsh or grating in sound.
noun. ['ˈgreɪtɪŋ'] a frame of iron bars to hold a fire.
noun. ['ˈgreɪtɪŋ'] 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.