What is the meaning of the word "psychedelic"?

Definitions:

  1. (of a mental state) characterized by intense and distorted perceptions and hallucinations and feelings of euphoria or sometimes despair copy to clipboard adjective
    • a psychedelic experience copy to clipboard
  2. having the vivid colors and bizarre patterns associated with psychedelic states copy to clipboard adjective
    • a psychedelic painting copy to clipboard
  3. producing distorted sensory perceptions and feelings or altered states of awareness or sometimes states resembling psychosis copy to clipboard adjective
    • psychedelic drugs like psilocybin and mescaline copy to clipboard