Blackthorn berries on the bush.
blackthorn definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- a thorny, white-flowered prunus shrub (Prunus spinosa) with purple or black, plumlike fruit; sloe
- a cane or stick made of the stem of this shrub
blackthorn definition by American Heritage Dictionary
A thorny deciduous Eurasian shrub (Prunus spinosa) having white flowers and small, bluish-black, plumlike fruits used chiefly for flavoring alcoholic beverages such as sloe gin. Also called sloe.