1. (p. pr. &. vb. n.) of Grate.

2. (n.) A partition, covering, or frame of parallel or cross bars; a latticework resembling a window grate; as, the grating of a prison or convent.

3. (n.) A system of close equidistant and parallel lines or bars, especially lines ruled on a polished surface, used for producing spectra by diffraction; -- called also diffraction grating.

4. (n.) The strong wooden lattice used to cover a hatch, admitting light and air; also, a movable Lattice used for the flooring of boats.

5. (a.) That grates; making a harsh sound; harsh.

6. (n.) A harsh sound caused by attrition.