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dirty bomb

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noun
  1. a nuclear warhead designed to produce a great amount of radioactive debris by use of a fusion core, fission trigger, and casing of uranium-238.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for dirty bomb

dirty bomb

noun
  1. informal a bomb made from nuclear waste combined with conventional explosives that is capable of spreading radioactive material over a very wide area
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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