Sludge
Pronunciation : Sludge
Part of Speech : n.
Etymology : [CF. Slush.]
Definition : 1. Mud; mire; soft mud; slush. Mortimer. Tennyson.
2. Small floating pieces of ice, or masses of saturated snow. Kane.
3. (Mining)
Defn: See Slime, 4. Sludge hole, the hand-hole, or manhole, in a steam boiler, by means of which sediment can be removed.
Source : Webster's Unabridged Dictionary, 1913