grating (
http://definr.com/grating)
adj : unpleasantly harsh or grating in sound; "a gravelly voice"
[syn:
gravel,
gravelly,
rasping,
raspy,
rough]
n 1: a barrier that has parallel or crossed bars blocking a
passage but admitting air [syn:
grate]
2: a frame of iron bars to hold a fire [syn:
grate]
3: 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 [syn:
diffraction grating]