Grating

Part of speech: noun (n.)

A partition, covering, or frame of parallel or cross bars; a latticework resembling a window grate; as, the grating of a prison or convent.

Part of speech: noun (n.)

A harsh sound caused by attrition.

Part of speech: adjective (a.)

That grates; making a harsh sound; harsh. -- Grat"ing*ly, adv.