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3 definitions found
 for hoarfrost
From The Collaborative International Dictionary of English v.0.48 :

  Frost \Frost\ (fr[o^]st; 115), n. [OE. frost, forst, AS. forst,
     frost. fr. fre['o]san to freeze; akin to D. varst, G., OHG.,
     Icel., Dan., & Sw. frost. [root]18. See Freeze, v. i.]
     1. The act of freezing; -- applied chiefly to the congelation
        of water; congelation of fluids.
        [1913 Webster]
  
     2. The state or temperature of the air which occasions
        congelation, or the freezing of water; severe cold or
        freezing weather.
        [1913 Webster]
  
              The third bay comes a frost, a killing frost.
                                                    --Shak.
        [1913 Webster]
  
     3. Frozen dew; -- called also hoarfrost or white frost.
        [1913 Webster]
  
              He scattereth the hoarfrost like ashes. --Ps.
                                                    cxlvii. 16.
        [1913 Webster]
  
     4. Coldness or insensibility; severity or rigidity of
        character. [R.]
        [1913 Webster]
  
              It was of those moments of intense feeling when the
              frost of the Scottish people melts like a snow
              wreath.                               --Sir W.
                                                    Scott.
        [1913 Webster]
  
     Black frost, cold so intense as to freeze vegetation and
        cause it to turn black, without the formation of
        hoarfrost.
  
     Frost bearer (Physics), a philosophical instrument
        illustrating the freezing of water in a vacuum; a
        cryophorus.
  
     Frost grape (Bot.), 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. --Knight.
  
     Frost nail, a nail with a sharp head driven into a horse's
        shoe to keep him from slipping.
  
     Frost smoke, an appearance resembling smoke, caused by
        congelation of vapor in the atmosphere in time of severe
        cold.
        [1913 Webster]
  
              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.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Hoarfrost \Hoar"frost`\, n.
     The white particles formed by the congelation of dew; white
     frost. [Written also horefrost. See Hoar, a.]
     [1913 Webster]
  
           He scattereth the hoarfrost like ashes.  --Ps. cxlvii.
                                                    16.
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

  hoarfrost
      n 1: ice crystals forming a white deposit (especially on objects
           outside) [syn: frost, hoar, hoarfrost, rime]

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