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frostline

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

An Americanism dating back to 1860–65; frost + line1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018