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high-level waste

noun
  1. radioactive waste material, such as spent nuclear fuel initially having a high activity and thus needing constant cooling for several decades by its producers before it can be reprocessed or treatedCompare intermediate-level waste, low-level waste
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012