1545-55; < Latin < Greek: immortality, food of the gods, noun use of feminine of ambrósios, equivalent to a-a-6 + -mbros- (combining form of brotōsmortal; akin to Latinmortuus dead, murder) + -ios adj. suffix; replacing Middle Englishambrose, ambrosie < Old Frenchambroise < Latin
1550s, "favored food or drink of the gods," from L. ambrosia, from Gk. fem. of ambrosios, lit. "of the immortals," from a- "not" + mbrotos, related to mortos "mortal." Applied to certain herbs by Pliny and Dioscorides; used of various foods for mortals since 1680s (originally of fruit drinks).