Sloe \Sloe\, n. [OE. slo, AS. sl[=a]; akin to D. slee, G. schlehe, OHG. sl$ha, Dan. slaaen, Sw. sl?n, perhaps originally, that which blunts the teeth, or sets them on edge (cf. Slow); cf. Lith. sliwa a plum, Russ. sliva.]

(Bot.) A small, bitter, wild European plum, the fruit of the blackthorn (Prunus spinosa); also, the tree itself.

Source: Webster's Revised Unabridged Dictionary (1913)