frost line

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Related to Frostline: Freezing depth

frost line

[′frȯst ‚līn]
(geology)
The maximum depth of frozen ground during the winter.
The lower limit of the permafrost.
(materials)
In polyethylene film extrusion, a ring-shaped area with a frosty appearance at the point where the film reaches its final diameter.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

frost line

An imaginary line indicating the depth of frost penetration in the ground.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Old pieces of metal pipe, rebar and smaller angle iron was inserted into the cavities of the blocks and rammed well below the frostline. The salvaged framework was laid on the blocks, and adjustments were made.
Once the working temperature was reached, it was possible to visually estimate the level of liquid [N.sub.2] within the reservoir due to the appearance of a "frostline".
Liquid level is measured from the frostline, which forms after the probe is removed from the vessel.
Few stoops are connected to their houses, and fewer still have frostline footings, which is why so many stoops have lost their balance and may suggest how they came to be named.