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sludge

 
Noun sludge has 2 senses
  1. sludge - the precipitate produced by sewage treatment
    --1 is a kind of
    precipitate
  2. sludge, slime, goo, gook, guck, gunk, muck, ooze - any thick messy substance
    --2 is a kind of substance, matter
    --2 has particulars: sapropel
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