defilement

Etymology

defile + -ment

noun

1. The act of defiling.
   Time has taken a terrible revenge upon mankind for his despoliation of the valleys and his defilement of the mountains, yet the industries and the railways of South Wales still put the bravest front upon an outlook which all may hope is becoming less saddening and less grim. 1939 September, D. S. Barrie, “The Railways of South Wales”, in Railway Magazine, page 165
2. The state of being defiled.
3. (military) The protection of the interior walls of a fortification from enfilading fire, as by covering them, or by a high parapet on the exposed side.