Gratings

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. (Optics) 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.

See: grate.

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