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]

 

© Webster 1913


Grat"ing, a. [See Grate to rub harshy.]

That grates; making a harsh sound; harsh. -- Grat"ing*ly, adv.

 

© Webster 1913


Grat"ing, n.

A harsh sound caused by attrition.

 

© Webster 1913


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.

 

© Webster 1913

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