tranquilizer

[trang-kwuh-lahy-zer]
noun
1.
a person or thing that tranquilizes.
2.
a drug that has a sedative or calming effect without inducing sleep.
4.
antipsychotic ( def 2 ).
Also, tranquillizer.


Origin:
1790–1800; tranquilize + -er1

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Collins
World English Dictionary
tranquillizer, (US) tranquilliser or (US) tranquilizer (ˈtræŋkwɪˌlaɪzə)
 
n
1.  a drug that calms a person without affecting clarity of consciousness
2.  anything that tranquillizes
 
tranquilliser, (US) tranquilliser or (US) tranquilizer
 
n
 
tranquilizer, (US) tranquilliser or (US) tranquilizer
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

tranquilizer tran·quil·iz·er (trāng'kwə-līz'ər, trān'-)
n.
A drug that promotes tranquility by calming, soothing, quieting, or pacifying without depressant effects.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
These won't dope them up as much as a tranquilizer, but should help calm them
  down.
He carefully aimed his tranquilizer gun at the tiger.
In fact, a vet from a local zoo shot one of the tigers with a tranquilizer dart.
Nearby, a volunteer veterinarian is skillfully giving a tranquilizer injection
  to a critically injured monkey.
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