- a shrub or tree of the genus Crataegus, as C. calpodendron.
- a walking stick made of a blackthorn tree or shrub.
- Also called sloe. a much-branched, thorny, Old World shrub, Prunus spinosa, having white flowers and small plumlike fruits.
- pear haw.
- Also called: sloe a thorny Eurasian rosaceous shrub, Prunus spinosa, with black twigs, white flowers, and small sour plumlike fruits
- a walking stick made from its wood