sloe

noun3

1. •
   The small, astringent, wild fruit of the blackthorn (Prunus spinosa).

   • There is also a dryness in the mouth from the increased action of the absorbent vessels, when a sloe or a crab-apple are masticated... — 1796
2. •
   The tree Prunus spinosa.
3. •
   Any of various other plants of the genus Prunus, as a shrub or small tree, Prunus alleghaniensis, bearing dark-purple fruit.