a type of rock music characterized by electronically amplified bizarre instrumental effects
Word origin
C20: from acid (sense 3), alluding to its supposed inspiration by drug-induced states of consciousness
acid rock in American English
US
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.