plum

Concise Oxford English Dictionary © 2008 Oxford University Press:
plum/plʌm/

▶noun

• 1 an oval fleshy fruit which is purple, reddish, or yellow when ripe, containing a flattish pointed stone.

• 2 the tree bearing plums. [Prunus domestica and related species.]

• 3 a reddish-purple colour.

• 4 [usu. as modifier] informal something highly desirable: a plum job.

– phrases
have a plum in one's mouth Brit. have an upper-class accent.

– origin OE plūme, from med. L. pruna, from L. prunum (see prune1).