Col`li*qua"tion (?), n. 1. A melting together; the act of melting; fusion.

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.

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.]