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frostline

 - 1 dictionary result

frost⋅line

[frawst-lahyn, frost-]
–noun
1. the maximum depth at which soil is frozen.
2. the lower limit of permafrost.


Origin:
1860–65, Americanism; frost + line 1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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