grating

[1]	grate
[2]	grate
[3]	diffraction grating , grate , grid , reticle/reticule , grille , lattice , trellis , screen , network , reticulation

adj.

[1]	jarring , strident , raucous , harsh , discordant , dissonant , unharmonious , offensive , irritating , irksome , annoying , vexatious , galling
[2]	grinding , gritty , squeaky , jangling , screeching , creaking , shrill , piercing , squawking , croaking , rasping
[3]	gravelly , rasping , raspy , rough , scratchy