Definition of sludge noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//slʌdʒ//
    ; NAmE NAmE//slʌdʒ//
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  1. 1thick, soft, wet mud or a substance that looks like it synonym slime There was some sludge at the bottom of the tank.
  2. 2industrial or human waste that has been treated industrial sludge the use of sewage sludge as a fertilizer on farm land
  3. Word Originearly 17th cent.: of uncertain origin; compare with slush.
See the Oxford Advanced American Dictionary entry: sludge