IPA: //ˈtræŋkwɪlaɪzər//
KK: /træŋˈkwɪlˌaɪzər/
A substance used to calm or relax a person or animal, often prescribed to reduce anxiety or agitation.
The doctor prescribed a tranquilizer to help her manage her anxiety during stressful situations.
Tranquillizer → It is formed from "tranquillus" (meaning calm or quiet) and the suffix "-izer" (meaning one who makes or causes). The word "tranquillizer" refers to something that causes calmness or tranquility.
Think of something that makes you 'calm' ('tranquillus') — that's why a tranquillizer is a substance that helps you feel calm.