Meaning of GRATING in English

GRATING

noun Date: 1622 a wooden or metal lattice used to close or floor an opening, a partition, covering, or frame of parallel bars or crossbars, a system of close equidistant and parallel lines or bars ruled on a polished surface to produce spectra by diffraction

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.