frost line


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

1860–65, Americanism; frost + line1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
frost line
1.  the deepest point in the ground to which frost will penetrate
2.  the limit towards the equator beyond which frosts do not occur

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
frost line  
  1. In regions where there is no permafrost, the maximum depth to which frost penetrates the ground in the winter.

  2. The lower limit of permafrost.

  3. In tropical regions, the elevation below which frost never occurs.

The American Heritage® Science Dictionary
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