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terrestrial radiation
ter·res·tri·al ra·di·a·tion


noun 
Definition:
 
radiation originating from Earth at night: electromagnetic radiation in the form of heat emitted by the Earth as it cools down at night, especially when the air is dry and there are no clouds
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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