tranquilizer definition
tranquilizer (trÃ¦ÅkwÉªlaÉªzÉr ) A tranquilizer is a drug that makes people feel calmer or less anxious. Tranquilizers are sometimes used to make people or animals become sleepy or unconscious. If a tranquilizer is prescribed, be sure your physician informs you of its possible side effects, such as addiction.