Variant of sludge
- mud, mire, or ooze covering the ground or forming a deposit at the bottom of bodies of water
- spongy lumps of drift ice
- any heavy, slimy deposit, sediment, or mass, as the waste resulting from oil refining, the mud brought up by a mining drill, the precipitate in a sewage tank, the sediment in a steam boiler or crankcase, etc.
Origin of sludgevariant, variety of slutch, sludge, mud: akin to Middle English sluchched, muddy, probably ultimately ; from Indo-European base an unverified form (s)leu-, to hang limply from source sleet, Middle High German slote, mud, ooze