Definition of prune tree in US English:

prune tree

noun

  • 1A plum tree; (in later use) specifically one of a variety having fruit suitable for drying.

  • 2Caribbean the tree Prunus occidentalis, having bark used medicinally and kernels used in the production of liqueur, and yielding useful timber.

Origin

Late 16th century; earliest use found in Thomas Newton (d. 1607), translator and Church of England clergyman.