Acid Rock Definition

A style of rock music of the late 1960s having a prominent repetitive beat and lyrics that suggest psychedelic experiences.
American Heritage
A form of rock music of the late 1960s and early 1970s intended to simulate or enhance a hallucinogenic experience and characterized by mystical or surrealistic lyrics, loud or distorted sounds, modal harmonies, etc.
Webster's New World
A rock music genre originating from the late 1960s, heavily inspired by or related to drug-induced experience.