Definition of sludge
2 : a muddy or slushy mass, deposit, or sediment: such asa : precipitated solid matter produced by water and sewage treatment processesb : muddy sediment in a steam boilerc : a precipitate or settling (such as a mixture of impurities and acid) from a mineral oil
3 : slush 5
sludgyplay \ˈslə-jē\ adjective
Examples of sludge in a Sentence
after a day of heavy rain, the fairgrounds had turned into pure sludge
I can't bring myself to read that sludge.
Recent Examples of sludge from the Web
And Pry was making plans to finish the sides with a sludge-like coating to give guests a better sense of the muddy hell these soldiers endured with little sleep.
Arauz leans his upper body into the exhaust and emerges holding a plastic cup filled with black sludge — a heavy-metal cocktail of cadmium, lead, and arsenic.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'sludge'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of sludge
Middle English slugge, perhaps alteration of slicche mud, slush; akin to Old High German slīh mire
First Known Use: 15th century
SLUDGE Defined for English Language Learners
Definition of sludge for English Language Learners
: thick, soft, wet mud
: a soft, thick material that is produced in various industrial processes (such as in the treatment of sewage)
: a thick material that can form in the oil in an engine and cause engine problems
SLUDGE Defined for Kids
Definition of sludge for Students
: a soft muddy mass resulting from sewage treatment
Medical Definition of sludge
: to form sludge positions that cause blood to sludge—L. K. Altman
Seen and Heard
What made you want to look up sludge? Please tell us where you read or heard it (including the quote, if possible).