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beam hole

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noun
a hole in the shield of a nuclear reactor through which a beam of radiation, esp of neutrons, is allowed to escape for experimental purposes
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Which of the following words describes “sky blue”?
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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

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