Definition of Eighteenth Amendment
The amendment to the U.S. Constitution added in 1919 which prohibited the manufacture, sale, transportation and exportation of intoxicating liquors in all the States and Territories of the United States and which was repealed in 1933 by the Twenty-first Amendment.
That's the definition of Eighteenth Amendment in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.