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.
© Webster 1913
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.
© Webster 1913