English dictionary sludge meaning and definition Definition and meaning of sludge at MeaningMonkey.org. sludge meaning and definition in the English Dictionary. SLUDGE nounDefinition of sludge (noun)the precipitate produced by sewage treatmentany thick, viscous mattersynonyms: goo, gook, goop, guck, gunk, muck, ooze, slime Source: Princeton University Wordnet
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