prunella n.

mid-14c., "a plum," also "a dried plum" (c. 1200 in place name Prunhill), from Old French pronne "plum" (13c.), from Vulgar Latin *pruna, fem. singular formed from Latin pruna, neuter plural of prunum "a plum," a dissimilated borrowing of Greek proumnon, from proumnē "plum tree," a word probably, like the tree itself, of Anatolian origin and thus from a language of Asia Minor. Slang meaning "disagreeable or disliked person" is from 1895. Prune juice is from 1807.