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permafrost
per·ma·frost [ púrmə fràwst ]


noun 
Definition:
 
permanently frozen land: underlying soil or rock that remains permanently frozen, found mainly in the polar regions
[Mid-20th century. <permanent]
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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