What is the meaning of grating?

noun

• A barrier that has parallel or crossed bars blocking a passage but admitting air.
  • synonyms: grate
• A frame of iron bars to hold a fire.
  • synonyms: grate
• 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

verb

• Furnish with a grate.
  • usage: "a grated fireplace"
  • synonyms: grate
• Gnaw into; make resentful or angry.
  • usage: "The injustice rankled her"; "his resentment festered"
  • synonyms: eat into, fret, rankle, grate
• Reduce to small shreds or pulverize by rubbing against a rough or sharp perforated surface.
  • usage: "grate carrots and onions"; "grate nutmeg"
  • synonyms: grate
• Make a grating or grinding sound by rubbing together.
  • usage: "grate one's teeth in anger"
  • synonyms: grate, grind
• Scratch repeatedly.
  • usage: "The cat scraped at the armchair"
  • synonyms: scrape, grate

adjective

• Unpleasantly harsh or grating in sound.
  • usage: "a gravelly voice"
  • synonyms: gravelly, rasping, raspy, rough, scratchy