frost line(redirected from frost lines)
Also found in: Dictionary, Financial.
Related to frost lines: Freezing depth
frost line[′frȯst ‚līn]
The maximum depth of frozen ground during the winter.
The lower limit of the permafrost.
In polyethylene film extrusion, a ring-shaped area with a frosty appearance at the point where the film reaches its final diameter.
An imaginary line indicating the depth of frost penetration in the ground.