frost line

== English == === Alternative forms === frostline === Noun === frost line (plural frost lines) The depth to which the water present in the soil is expected to freeze in winter. Synonyms: frost depth, freezing depth The depth to which the water present in the soil is actually frozen in a given place at a given point in time. Synonym: frost front (astrophysics) In a solar system, the distance from the protosun beyond which hydrogen-containing gas compounds freeze. Synonyms: snow line, ice line ==== Translations ====