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uplight
uplink
upload
upmanship
upmarket
upmost
upon
upper
upper atmosphere
upper bound
Upper Canada
Upper Carboniferous
upper chamber
upper circle
upper class
upper crust
upper hand
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upper atmosphere
up·per at·mos·phere


noun 
Definition:
 
part of Earth's atmosphere: the part of the Earth's atmosphere above the troposphere, especially at heights unreachable by balloon
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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