Frostline - definition of frostline by The Free Dictionary
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1. (Geological Science) the deepest point in the ground to which frost will penetrate
2. (Geological Science) the limit towards the equator beyond which frosts do not occur
frost•line (ˈfrɔstˌlaɪn, ˈfrɒst-)
1. the maximum depth at which soil is frozen.
2. the lower limit of permafrost.
References in periodicals archive
Sunday evening and Monday is expected to be slightly cooler, but the frostline
will stay south of the continent with only a limited effect to the north.
is a rye beer that does not stint on the rye.
By measuring the bubble soon after the frostline
, the system can achieve proper bubble size without waiting for the film to pass through the top nip rollers.