Origin: Frostted; Frosting.
4. Coldness or insensibility; severity or rigidity of character. It was of those moments of intense feeling when the frost of the Scottish people melts like a snow wreath. (Sir W. Scott) black frost, cold so intense as to freeze vegetation and cause it to turn black, without the formation of hoarfrost.
(Science: botany) frost grape, an American grape, with very small, acid berries. Frost lamp, a lamp placed below the oil tube of an Argand lamp to keep the oil limpid on cold nights; used especially in lighthouses. Frost nail, a nail with a sharp head driven into a horses shoe to keen him from slipping. Frost smoke, an appearance resembling smoke, caused by congelation of vapor in the atmosphere in time of severe cold. The brig and the ice round her are covered by a strange black obscurity: it is the frost smoke of arctic winters. (Kane) frost valve, a valve to drain the portion of a pipe, hydrant, pump, etc, where water would be liable to freeze. Jack frost, a popular personification of frost.