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sludge (n.)

"mud, mire, ooze," 1640s, of uncertain origin, possibly a variant of Middle English slutch "mud, mire," or a variant of slush (n.).

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Definitions of sludge

sludge (n.)
the precipitate produced by sewage treatment;
sludge (n.)
any thick, viscous matter;
Synonyms: slime / goo / goop / gook / guck / gunk / muck / ooze
From wordnet.princeton.edu