deadly nightshade

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The plant Atropa belladonna, a perennial shrub of the nightshade family that contains high concentrations of the alkaloid atropine which can be deadly if taken in excess.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America
• noun perennial Eurasian herb with reddish bell-shaped flowers and shining black berries; extensively grown in United States; roots and leaves yield atropine