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boiling-water reactor

noun
  1. a nuclear reactor using water as coolant and moderator, steam being produced in the reactor itself: enriched uranium oxide cased in zirconium is the fuelAbbreviation: BWR
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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