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

• class Crinoidea
• class Crustacea
• class Cryptophyceae
• class Cyanobacteria
• class Cyanophyceae
• class Cycadopsida
• class Cyclosporeae
• class Deuteromycetes
• class Diatomophyceae
• class Dicotyledonae
• class Dicotyledones
• class Diplopoda
• class Echinoidea
• class Equisetatae
• class Euglenophyceae
• class Eumycetes
• class feeling
• class fellow
• class Filicinae
• class Filicopsida
• class Flagellata
• class Gasteromycetes
• class Gasteropoda
• class Gastromycetes
• class Gastropoda