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subterfuge
subterminal
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substratosphere
sub·strat·o·sphere [ sub stráttə sfr ]


noun 
Definition:
 
lowest region of Earth's atmosphere: the lowest layer of the Earth's atmosphere, at a height of about 20 km (12 mi) above the Earth
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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