1. (noun) a barrier that has parallel or crossed bars blocking a passage but admitting air

• grate

2. (noun) a frame of iron bars to hold a fire

• grate

3. (noun) 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

• diffraction grating

4. (adjective) unpleasantly harsh or grating in sound

• gravelly
• rasping
• raspy
• rough
• scratchy

1. (noun) a barrier that has parallel or crossed bars blocking a passage but admitting air

• barrier

2. (noun) a frame of iron bars to hold a fire

• framework

3. (noun) 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

• optical device

1. (adjective) unpleasantly harsh or grating in sound

• cacophonic
• cacophonous

1. (noun) a barrier that has parallel or crossed bars blocking a passage but admitting air

• grille
• radiator grille

2. (noun) 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

• echelon

1. (noun) a barrier that has parallel or crossed bars blocking a passage but admitting air

• grate

2. (noun) a frame of iron bars to hold a fire

• grate
• grate

3. (adjective) unpleasantly harsh or grating in sound

• harshness
• roughness
• rasp
• rasping
• scrape
• scraping
• scratch
• scratching