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 The loose material that comes from something being grated.
Add a few gratings of nutmeg to the hot milk.
noun An optical system of close equidistant and parallel lines or bars, especially lines ruled on a polished surface, used for producing spectra by diffraction.
noun The strong wooden lattice used to cover a hatch, admitting light and air; also, a movable lattice used for the flooring of boats.
noun The sound made by something that grates against something else.