n.
A crystalline compound, C20H25N3O, derived from lysergic acid and used as a powerful hallucinogenic drug. Also called acid.
[L(Y)S(ERGIC ACID) D(IETHYLAMIDE).]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.