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

     

    sludge

     noun
    noun
    BrE BrE//slʌdʒ//
     
    ; NAmE NAmE//slʌdʒ//
     
    [uncountable]
     
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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 Origin early 17th cent.: of uncertain origin; compare with slush.
See the Oxford Advanced American Dictionary entry: sludge