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.
"bushes can be blackthorn."
This list can help you learn new vocabulary more quickly and be able explore other words more easily.