Prune, n. [F. prune, from L. prunum a plum. See Plum.] A plum; esp., a dried plum, used in cookery; as, French or Turkish prunes; California prunes.
German prune(Bot.), a large dark purple plum, of oval shape, often one-sided. It is much used for preserving, either dried or in sirup. — Prune tree. (Bot.) (a) A tree of the genus Prunus (P. domestica), which produces prunes. (b) The West Indian tree, Prunus occidentalis. — South African prune(Bot.), the edible fruit of a sapindaceous tree (Pappea Capensis).