atomic pile

noun Physics.

reactor (def. 4).

Origin:
1940–45

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Atomic pile is always a great word to know.

So is conduction. Does it mean:

the atomic number or neutron number of an exceptionally stable nuclide

the transfer of heat between two parts of a stationary system, caused by a temperature difference between the parts

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Collins

World English Dictionary

atomic pile

—n
	the original name for a nuclear reactor

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage

Science Dictionary

atomic pile
An early type of nuclear reactor whose core consisted of layers of graphite block interspersed with uranium, designed to create a sustained fission reaction.

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