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frostline

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WordReference Random House Unabridged Dictionary of American English © 2026

frost•line n.

Geographythe maximum depth at which soil is frozen.
Geographythe lower limit of permafrost. Cf. permafrost table.

frost + line¹ 1860–65, American.

'frostline' also found in these entries (note: many are not synonyms or translations):

permafrost table

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