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red mercury

noun
  1. a supposedly radioactive substance that could be used in a bomb made from nuclear waste, widely believed to be part of a confidence trick in which gangsters sold useless material to terrorists in the early 1990s
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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