1713, from French gélatine (17c.) "clear jelly-like substance, fish broth," from Italian gelatina, from gelata "jelly," from gelare "to jell," from Latin gelare "to freeze" (see cold (adj.)), + chemical suffix -ine (2). Spelling without the final -e is from 1800. "The form without final -e is in scientific (or pseudo-scientific) use only ..." [Fowler].
gelatin gel·a·tin or gel·a·tine (jěl'ə-tn)
A derived protein formed by boiling collagen of animal tissues.