1. 
   Tranquillizer
   • (n.) One who, or that which, tranquilizes.
   Found op http://thinkexist.com/dictionary/meaning/tranquillizer/
   
   
2. 
   tranquillizer
   (L. tranquillus quiet, calm + -ize verb ending meaning to make + - er agent) a drug with a calming, soothing effect.
   Found op http://users.ugent.be/~rvdstich/eugloss/DIC/dictio87.html
   
   
3. 
   tranquillizer
   tranquillizer (U.S.)
   Found op http://www.wordinfo.info/words/index/info/view_unit/1820/4
   
   
4. 
   tranquillizer
   Common name for any drug for reducing anxiety or tension (anxiolytic), such as benzodiazepines, barbiturates, antidepressants, and beta-blockers. The use of drugs to control anxiety is becoming much less popular, because most of the drugs available are capable of inducing dependence
   Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0006530.html
   
   
5. 
   tranquillizer
   1) Antianxiety agent 2) Ataractic 3) Ataractic agent 4) Ataractic drug 5) Downer 6) Psychotropic agent 7) Sedative 8) Sedative-hypnotic 9) Sedative-hypnotic drug 10) Tranquilizer 11) Tranquilliser
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/tranquillizer/1
   
   

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