'Sludge hole' definitions:

Definition of 'Sludge hole'

From: GCIDE
  • Sludge \Sludge\, n. [CF. Slush.]
  • 1. Mud; mire; soft mud; slush. --Mortimer. Tennyson. [1913 Webster]
  • 2. Small floating pieces of ice, or masses of saturated snow. --Kane. [1913 Webster]
  • 3. (Mining) See Slime, 4. [1913 Webster]
  • 4. Anything resembling mud or slush; as: (a) A muddy or slimy deposit from sweage. (b) Mud from a drill hole in boring. (c) Muddy sediment in a steam boiler. (d) Settling of cottonseed oil, used in making soap, etc. (e) A residuum of crude paraffin-oil distillation. [Webster 1913 Suppl.]
  • Sludge hole, the hand-hole, or manhole, in a steam boiler, by means of which sediment can be removed. [1913 Webster]