or tran·quil·liz·er

See more synonyms for tranquilizer on

Origin of tranquilizer

First recorded in 1790–1800; tranquilize + -er1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for tranquillizer


tranquilliser or US tranquilizer

  1. a drug that calms a person without affecting clarity of consciousness
  2. anything that tranquillizes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for tranquillizer



"sedative," 1824 (first reference is to ground ivy), agent noun from tranquilize; in reference to one of a large group of anti-anxiety drugs, it is recorded by 1956.

Online Etymology Dictionary, © 2010 Douglas Harper

tranquillizer in Medicine


[trăngkwə-līz′ər, trăn-]
  1. Any of various drugs used to reduce tension or anxiety; an antianxiety agent.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.