The Collaborative International Dictionary of English v.0.48:

Colliquation \Col`li*qua"tion\, n.
   1. A melting together; the act of melting; fusion.
      [1913 Webster]

            When sand and ashes are well melted together and
            suffered to cool, there is generated, by the
            colliquation, that sort of concretion we call
            "glass".                              --Boyle.
      [1913 Webster]

   2. (Med.) A processive wasting or melting away of the solid
      parts of the animal system with copious excretions of
      liquids by one or more passages. [Obs.]
      [1913 Webster]