blackthorn

noun

1. a shrub or tree of the genus Crataegus, as C. calpodendron.
2. a walking stick made of a blackthorn tree or shrub.
3. Also called sloe. a much-branched, thorny, Old World shrub, Prunus spinosa, having white flowers and small plumlike fruits.
4. pear haw.

noun

1. Also called: sloe a thorny Eurasian rosaceous shrub, Prunus spinosa, with black twigs, white flowers, and small sour plumlike fruits
2. a walking stick made from its wood