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English definition of “high-level waste”

high-level waste

noun [U]    
waste, such as nuclear fuel that has been used to produce electricity, that is very radioactive and needs to be kept cool for many years before it can be got rid of without harming the environmentRubbish and wasteEnvironmental issues
(Definition of high-level waste noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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