Pronunciation: (frôst'līn", frost'-), Strict Standards: Non-static method FenSites::linkTo() should not be called statically in /site/html/dictionary/frostline.html on line 71 [key]
1. the maximum depth at which soil is frozen.
2. the lower limit of permafrost. Cf. permafrost table.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.