meaning of grating

1. A partition, covering, or frame of parallel or cross bars; a latticework resembling a window grate; as, the grating of a prison or convent.
2.
A system of close equidistant and parallel lines lines or bars, especially lines ruled on a polished surface, used for producing spectra by diffraction; -- called also diffraction grating.
3.
The strong wooden lattice used to cover a hatch, admitting light and air; also, a movable Lattice used for the flooring of boats.
4.
That grates; making a harsh sound; harsh.
5.
A harsh sound caused by attrition.
6.
of Grate
7.
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


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