frostline


frostline

(ˈfrɒstˌlaɪn) n1. (Geological Science) the deepest point in the ground to which frost will penetrate2. (Geological Science) the limit towards the equator beyond which frosts do not occur

frost•line

(ˈfrɔstˌlaɪn, ˈfrɒst-)

n. 1. the maximum depth at which soil is frozen. 2. the lower limit of permafrost. [1860–65, Amer.]