LSD

LSD

noun \ˌel-ˌes-ˈdē\

Definition of LSD

: a semisynthetic illicit organic compound C₂₀H₂₅N₃O derived from ergot that induces extreme sensory distortions, altered perceptions of reality, and intense emotional states, that may also produce delusions or paranoia, and that may sometimes cause panic reactions in response to the effects experienced—called also acid, lysergic acid diethylamide, lysergide