The Collaborative International Dictionary of English v.0.48:
LSD \LSD\ n. lysergic acid diethylamide, a powerful hallucinogenic drug. [Acronym] Syn: lysergic acid diethylamide, acid. [WordNet 1.5]WordNet (r) 3.0 (2006):
LSD n 1: a powerful hallucinogenic drug manufactured from lysergic acid [syn: lysergic acid diethylamide, LSD]