Meaning of GRATING in English

GRATING

[grat.ing] n (1626) 1: a wooden or metal lattice used to close or floor any of various openings

2: a partition, covering, or frame of parallel bars or crossbars

3: a system of close equidistant and parallel lines or bars ruled on a polished surface to produce spectra by diffraction

Merriam-Webster English vocab.      Английский словарь Merriam Webster.