Hypertext Webster Gateway: "sludge"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Sludge \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.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Sludge \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.
From WordNet (r) 1.7 (wn)
sludge
n 1: the precipitate produced by sewage treatment
2: any thick messy substance [syn: {slime}, {goo}, {gook}, {guck},
{gunk}, {muck}, {ooze}]
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