The Collaborative International Dictionary of English v.0.48:

Palatize \Pal"a*tize\, v. t.
   To modify, as the tones of the voice, by means of the palate;
   to palatalize; as, to palatize a letter or sound. --
   Pal`a*ti*za"tion, n. --J. Peile.
   [1913 Webster]