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 ]