sludge
noun /slʌdʒ/
/slʌdʒ/
[uncountable]- thick, soft, wet mud or a substance that looks like it synonym slime
- There was some sludge at the bottom of the tank.
- industrial or human waste that has been treated
- industrial sludge
- the use of sewage sludge as a fertilizer on farm land
Word Originearly 17th cent.: of uncertain origin; compare with slush.