The Collaborative International Dictionary of English v.0.48:

Deliquiate \De*liq"ui*ate\, v. i. [L. deliquia a flowing off, a
   gutter, deliquium a flowing down, fr. deliquare. See
   Deliquate.]
   To melt and become liquid by absorbing water from the air; to
   deliquesce. --Fourcroy.
   [1913 Webster]