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1. School of Mahayana Buddhism asserting that enlightenment can come through meditation and intuition rather than faith; China and Japan
   - Zen Buddhism
    
2. A Buddhist doctrine that enlightenment can be attained through direct intuitive insight
   - Zen Buddhism
    
3. Street name for lysergic acid diethylamide
   - acid, back breaker, battery-acid, dose, dot, Elvis, loony toons, Lucy in the sky with diamonds, pane, superman, window pane

Type of: Buddhism, LSD, lysergic acid diethylamide

Encyclopedia: Zen Zen, or the Skill to Catch a Killer