7 letters · 9 points in Scrabble
noun a barrier that has parallel or crossed bars blocking a passage but admitting air
noun a frame of iron bars to hold a fire
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
originEtymology tree English grat(e) English -ing English grating From grat(e) + -ing.
Etymology from Wiktionary, CC BY-SA 3.0