The Collaborative International Dictionary of English v.0.48:

Hepatization \Hep`a*ti*za"tion\, n.
   1. (Chem.) Impregnating with sulphureted hydrogen gas. [Obs.]
      [1913 Webster]

   2. [Cf. F. h['e]patisation.] (Med.) Conversion into a
      substance resembling the liver; a state of the lungs when
      gorged with effused matter, so that they are no longer
      pervious to the air.
      [1913 Webster]