Etymology
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grating (adj.)

"annoying, irritating," 1560s, figurative use of present-participle adjective from grate (v.).

grating (n.)

"partition or frame of parallel crossing bars," 1620s, from grate (n.).

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Definitions of grating
1
grating (n.)
a barrier that has parallel or crossed bars blocking a passage but admitting air;
Synonyms: grate
grating (n.)
a frame of iron bars to hold a fire;
Synonyms: grate
grating (n.)
optical device consisting of a surface with many parallel grooves in it; disperses a beam of light (or other electromagnetic radiation) into its wavelengths to produce its spectrum;
Synonyms: diffraction grating
2
grating (adj.)
unpleasantly harsh or grating in sound;
Synonyms: gravelly / rasping / raspy / rough / scratchy
From wordnet.princeton.edu