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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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British Dictionary definitions for frost line

frost line

noun
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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frost line in Science
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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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8
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