Pronunciation: (blak'thôrn"), [key]
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. See pear haw.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.