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GRATING - Definiția din dicționar

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Grat"ing (?), 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.
[1913 Webster]

2. (Optics) A system of close equidistant parallel lines or bars, esp. lines ruled on a polished surface, used for producing spectra by diffraction; -- called also diffraction grating. Gratings have been made with over 40,000 such lines to the inch, but those with a somewhat smaller number give the best definition. They are used, e. g., to produce monochromatic light for use in optical instruments such as spectrophotometers.
[Webster 1913 Suppl.]

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.
[1913 Webster]

 

Grat"ing, a. [See Grate to rub harshy.] That grates; making a harsh sound; harsh. -- Grat"ing*ly, adv.
[1913 Webster]

 

Grat"ing, n. A harsh sound caused by attrition.
[1913 Webster]