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Source : Webster's Revised Unabridged Dictionary (1913)

Grating \Grat"ing\, n. (Optics)
   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.

Grate \Grate\, v. t. [imp. & p. p. {Grated}; p. pr. &. vb. n.
   To furnish with grates; to protect with a grating or
   crossbars; as, to grate a window.

Grating \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.

   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. 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]

Grating \Grat"ing\, a. [See {Grate} to rub harshy.]
   That grates; making a harsh sound; harsh. -- {Grat"ing*ly},

Grating \Grat"ing\, n.
   A harsh sound caused by attrition.

Source : WordNet®

     adj : unpleasantly harsh or grating in sound; "a gravelly voice"
           [syn: {gravel}, {gravelly}, {rasping}, {raspy}, {rough}]

     n 1: a barrier that has parallel or crossed bars blocking a
          passage but admitting air [syn: {grate}]
     2: a frame of iron bars to hold a fire [syn: {grate}]
     3: 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 [syn: {diffraction grating}]
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