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atmosphere
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atom bomb
atom bomb (plural atom bombs)


noun 
Definition:
 
UK nuclear weapon: an explosive device whose great destructive power is due to the uncontrollable release of energy from the fission of heavy nuclei such as the nuclei of uranium-235 or plutonium-239, by neutrons sustaining a rapid chain reaction.
Australian, North American term  atomic bomb
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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