Source : Webster's Revised Unabridged Dictionary (1913)

Gelatinize \Ge*lat"i*nize\, v. t.
   1. To convert into gelatin or jelly. Same as {Gelatinate}, v.
      t.

   2. (Photog.) To coat, or otherwise treat, with gelatin.

Gelatinize \Ge*lat"i*nize\, v. i.
   Same as {Gelatinate}, v. i.

Source : WordNet®

gelatinize
     v 1: coat with gelatin
     2: become gelatinous or change into a jelly; "the starch
        gelatinized when it was heated" [syn: {gelatinise}]
     3: convert into gelatinous form or jelly; "hot water will
        gelatinize starch" [syn: {gelatinise}]