Definition of gratings:
(adj) :
(typically of a voice) Harsh and unpleasant.
(adj) :
Abrasive; tending to annoy.
(n) :
The sound made by something that grates against something else.
(n) :
The loose material that comes from something being grated.
(n) :
A barrier that has parallel or crossed bars blocking a passage but admitting air.
(n) :
(nautical, in the plural) The strong wooden lattice used to cover a hatch, admitting light and air; also, a movable lattice used for the flooring of boats.