The Collaborative International Dictionary of English v.0.48:

jellify \jel"li*fy\, v. t. & i. [imp. & p. p. Jellified; p.
   pr. & vb. n. Jellifying.]
   To make, or to become, gelatinous; to make into jelly; to
   jelly. -- Jel`li*fi*ca"tion, n.
   [Webster 1913 Suppl.] Jell-O