Meaning of SLUDGE in English

SLUDGE

/ slʌdʒ; NAmE / noun [ U ]

1.

thick, soft, wet mud or a substance that looks like it

SYN slime :

There was some sludge at the bottom of the tank.

2.

industrial or human waste that has been treated :

industrial sludge

the use of sewage sludge as a fertilizer on farm land

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WORD ORIGIN

early 17th cent.: of uncertain origin; compare with slush .

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.