plum

English plum comes from Middle English plomme, from Old English plūme, from Proto-West Germanic *plūmā, which was borrowed from Latin prūnum, itself likely from an Anatolian source via Ancient Greek προῦμνον (proûmnon).

The word's shape shifted gradually as it passed through Germanic and English forms — from plūme to plomme to plum — while its meaning stayed put, always pointing to the same fruit.

Plum is a doublet of prune, meaning both words trace back to the same Latin ancestor, prūnum, but arrived in English by different paths.