Webster’s Revised Unabridged Dictionary · 1913
Gelatinate
Ge·lat′i·nate (jē·lăt′ĭ·nāt), v. t. [imp. & p. p. Gelatinated; p. pr. & vb. n. Gelatinating.] To convert into gelatin, or into a substance resembling jelly.
Ge·lat′i·nate, v. i. To be converted into gelatin, or into a substance like jelly.
Lapis lazuli, if calcined, does not effervesce, but gelatinates with the mineral acids. Kirwan.