plum Look up plum at Dictionary.com
O.E. plume, early Gmc. borrowing (cf. M.Du. prume, O.H.G. phruma, Ger. Pflaume) from V.L. *pruna, from L. prunum "plum," from Gk. prounon, later form of proumnon, from an Asiatic language. Change of pr- to pl- is unique to Gmc. Meaning "something desirable" is first recorded 1780, probably in ref. to the sugar-rich bits of a plum pudding, etc.