The Collaborative International Dictionary of English v.0.48:

Regelation \Re`ge*la"tion\ (-l?"sh?n), n. [Pref. re- + L.
   gelatio a freezing.] (Physics)
   The act or process of freezing anew, or together,as two
   pieces of ice.
   [1913 Webster]

   Note: Two pieces of ice at (or even) 32? Fahrenheit, with
         moist surfaces, placed in contact, freeze together to a
         rigid mass. This is called regelation. --Faraday.
         [1913 Webster]