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English definition of “slag”

slag

noun [U] [U] (WASTE)    /slæɡ/
waste material produced when coal is dug from the ground , or a substance produced by mixing chemicals with metal that has been heated until it is liquid in order to remove unwanted substances from it → See also slag heapRubbish and wasteEnvironmental issues
(Definition of slag noun (WASTE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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