Entry 3 senses · 2 variants Webster, 1913 Gelatinize · Ge·lat·i·nize · IPA v. t. v. i. 01 v. t. To convert into gelatin or jelly. Same as Gelatinate, v. t. 1. To convert into gelatin or jelly. Same as Gelatinate, v. t. See: Gelatinate 2. To coat, or otherwise treat, with gelatin.(Photog.) 02 v. i. Same as Gelatinate, v. i. 1. Same as Gelatinate, v. i. See: Gelatinate