atomic-pile

atomic pile

noun Physics.
reactor ( def 4 ).

Origin:
1940–45

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World English Dictionary
atomic pile
 
n
the original name for a nuclear reactor

Collins English Dictionary - Complete & Unabridged 10th Edition
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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.
The American Heritage® Science Dictionary
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