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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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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red mercuric oxide
red mercuric sulfide