frostline

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


Origin:
1860–65, Americanism; frost + line1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
To place an end-bearing pile, excavate a hole a little wider than the pile to a point below the frostline.
Frogs and turtles bury themselves in the mud below the frostline.
The valve shall be located below the frostline and installed so that it may be operated from the surface of the fill or ground.
Excavation may be substantial in areas where there is a deep frostline.
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