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Noun: sapropel
  1. Sludge (rich in organic matter) that accumulates at the bottom of lakes or oceans

Derived forms: sapropels

Type of: gloop [Brit, Cdn, informal], goo [informal], gook [informal], goop [N. Amer, informal], guck [N. Amer, informal], gunk [informal], muck, ooze, slime, sludge, thick

Encyclopedia: Sapropel