The American Heritage® Dictionary of the English Language, 4th Edition
n. Any of several plants of the genus Datura, having trumpet-shaped flowers up to 25 centimeters (10 inches) long and usually prickly fruits. The leaves and seeds yield alkaloids with narcotic properties. Also called thorn apple.
"It is from one to five feet in height, and an ill-smelling weed, though first cousin to the beautiful, cultivated datura, which is a highly prized garden plant."