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Noun: sludge  slúj
  1. The precipitate produced by sewage treatment
     
  2. Any thick, viscous matter
    - slime, goo, goop [N. Amer], gook, guck [N. Amer], gunk, muck, ooze, thick, gloop [Brit, Cdn]

Derived forms: sludges

Type of: matter, precipitate

Encyclopedia: Sludge