Definition from Wiktionary, the free dictionary
- Rhymes: -eɪtɪŋ
grating (plural gratings)
- A barrier that has parallel or crossed bars blocking a passage but admitting air.
- A frame of iron bars to hold a fire.
- An optical system of close equidistant and parallel lines or bars, especially lines ruled on a polished surface, used for producing spectra by diffraction.
- (nautical, in the plural) The strong wooden lattice used to cover a hatch, admitting light and air; also, a movable lattice used for the flooring of boats.
Related terms 
frame to hold a fire
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- Present participle of grate.