Sludge (?), n. [CF. Slush.]
1. Mud; mire; soft mud; slush.
Mortimer. Tennyson.
2. Small floating pieces of ice, or masses of
saturated snow. Kane.
3. (Mining) See Slime,
4.
Sludge hole, the hand-hole, or manhole, in a
steam boiler, by means of which sediment can be removed.
Sludge (?), n. 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.