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frostline

[frawst-lahyn, frost-] /ˈfrɔstˌlaɪn, ˈfrɒst-/
noun
1.
the maximum depth at which soil is frozen.
2.
the lower limit of permafrost.
Compare permafrost table.
Origin
1860-1865
1860-65, Americanism; frost + line1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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