verb (used with object), verb (used without object), tranquilized, tranquilizing.
to make or become tranquil.
Also, tranquillize;, especially British, tranquillise.

1615–25; tranquil + -ize

tranquilization, noun
untranquilize, verb (used with object), untranquilized, untranquilizing. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To tranquilize
World English Dictionary
tranquillize, tranquillise or tranquilize (ˈtræŋkwɪˌlaɪz)
to make or become calm or calmer
tranquillise, tranquillise or tranquilize
tranquilize, tranquillise or tranquilize
tranquilli'zation, tranquillise or tranquilize
tranquilli'sation, tranquillise or tranquilize
tranquili'zation, tranquillise or tranquilize

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

tranquilize tran·quil·ize or tran·quil·lize (trāng'kwə-līz', trān'-)
v. tran·quil·ized or tran·quil·lized, tran·quil·iz·ing or tran·quil·liz·ing, tran·quil·iz·es or tran·quil·liz·es

  1. To make tranquil; pacify.

  2. To sedate or relieve of anxiety or tension by the administration of a drug.

  3. To become tranquil; relax.

  4. To have a calming or soothing effect.

tran'quil·i·za'tion (-kwə-lĭ-zā'shən) n.
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
The scientists must send a team to tranquilize the bear with a dart gun, but
  they don't know how many gunners to send.
To tranquilize or not to tranquilize, that is the question.
Vets were planning to tranquilize him, bring him to the park's wildlife
  rehabilitation center, and nurse him back to health.
Test your reaction time here by seeing how fast you can tranquilize speedy
  cartoon sheep.
Related Words
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