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Grating
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.
GratingGrate Grate, v. t. [imp. & p. p. Grated; p. pr. &. vb. n.
Grating.]
To furnish with grates; to protect with a grating or
crossbars; as, to grate a window. GratingGrating 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] GratingGrating Grat"ing, a. [See Grate to rub harshy.]
That grates; making a harsh sound; harsh. -- Grat"ing*ly,
adv. Grating
Grating Grat"ing, n.
A harsh sound caused by attrition.
Meaning of Gratings from wikipedia