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Definition of: sludge
(sluj) noun
1. Soft, water-soaked mud; mire.
2. A slush of snow or broken or half-formed ice.
3. Muddy or pasty refuse of various kinds, as that produced by the action of a rock drill and in the purification of sewage.
4. The sediment in a water tank or boiler. [<earlier slutch.? Related to SLUSH]
—sludg′y adjective
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