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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 of frostline
1860-1865
1860-65, Americanism; frost + line1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for frost line
Historical Examples
  • It should be a permanent trellis, made of cedar posts set three feet deep, so as to be below the frost line and four feet high.

    A Woman's Hardy Garden Helena Rutherfurd Ely
  • Thus in a half hour we passed the frontier between the agricultural folk below the frost line and the shepherd folk above it.

  • The crevices where racers hibernate are known to be several feet deep in some instances, extending well below the frost line.

  • Then the pipe throughout its entire length must be in a trench below the frost line at the entrance to the spring as elsewhere.

    Rural Hygiene Henry N. Ogden
  • This is done to get the invalid below the frost line as quickly as possible.

    The houseboat book William F. Waugh
  • It should never be so high that it will come above the frost line which is two and a half feet in depth.

    Garden Ornaments Mary H. Northend
  • Earthworms live underground in burrows that are sunk well below the frost line.

  • The march of civilization has actually pushed back the frost line some distance.

    Reading the Weather Thomas Morris Longstreth
  • Growers tell me that Snyder blackberries are killed down to the frost line, which proves it is not iron-clad, as some believe.

  • Gasoline is admitted through pipes below the frost line from two 50-gallon tanks underground, 30 feet from building.

    Farm Boys and Girls William Arch McKeever
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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