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(), n.[See 2d Grate.] 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. (Opt.) 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. pl. (Naut.) The strong wooden lattice used to cover a hatch, admitting light and air; also, a movable Lattice used for the flooring of boats. Grat"ing a.[See Grate to rub harshy.] That grates; making a harsh sound; harsh. -- Grat"ingly, adv. Grat"ing n.A harsh sound caused by attrition. Grat"ing (), n.(Opt.) A system of close equidistant parallel lines or bars, esp. lines ruled on a polished surface, used for producing spectra by diffraction. Gratings have been made with over 40,000 such lines to the inch, but those with a somewhat smaller number give the best definition. スポンサード リンク
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