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  1. Oxford American Dictionary

    grating

    • IPA[ˈɡrādiNG]

    美式

    • n.
      a framework of parallel or crossed bars, typically preventing access through an opening while permitting communication or ventilation.；a set of equally spaced parallel wires, or a surface ruled with equally spaced parallel lines, used to produce spectra by diffraction.

    • noun: grating, plural noun: gratings