Longman Dictionary of Contemporary English homepage

Topic: INDUSTRY

Date: 1600-1700
Origin: Probably from slush

sludge

 noun
     
sludge [uncountable]
1DN soft thick mud, especially at the bottom of a liquid
2TI the solid substance that is left when industrial waste or sewage (=the liquid waste from toilets) has been cleaned
3TTC thick dirty oil in an engine
—sludgy adjective
Definition of sludge from the Longman Dictionary of Contemporary English within
the topic INDUSTRY
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The INDUSTRY
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pulp

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