[yoo-thuh-ney-zhuh, -zhee-uh, -zee-uh]
Also called mercy killing. the act of putting to death painlessly or allowing to die, as by withholding extreme medical measures, a person or animal suffering from an incurable, especially a painful, disease or condition.
painless death.

1640–50; < Neo-Latin < Greek euthanasía an easy death, equivalent to eu- eu- + thánat(os) death + -ia -y3

euthanasiast [yoo-thuh-ney-zee-ast] , noun
euthanasic [yoo-thuh-ney-zik] , adjective
proeuthanasia, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
euthanasia (ˌjuːθəˈneɪzɪə)
Also called: mercy killing the act of killing someone painlessly, esp to relieve suffering from an incurable illness
[C17: via New Latin from Greek: easy death, from eu- + thanatos death]

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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Word Origin & History

c.1600, from Gk. euthanasia "an easy or happy death," from eu- "good" + thanatos "death." Sense of "legally sanctioned mercy killing" is first recorded in English 1869.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

euthanasia eu·tha·na·sia (yōō'thə-nā'zhə, -zhē-ə)

  1. The act or practice of ending the life of an individual suffering from a terminal illness or an incurable condition, as by lethal injection or the suspension of extraordinary medical treatment.

  2. A quiet, painless death.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
euthanasia   (y'thə-nā'zhə)  Pronunciation Key 
The act or practice of painlessly ending the life of an animal or a willing individual who has a terminal illness or incurable condition, as by giving a lethal drug.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
euthanasia [(yooh-thuh-nay-zhuh)]

Painlessly putting someone to death — usually someone with an incurable and painful disease; mercy killing.

Note: Proposals to make euthanasia legal in the United States have inspired heated debate.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
This appeal to prepare for euthanasia has caused particular resentment in some
  of his critics.
Veterinarians and veterinary technicians face a number of ethical dilemmas,
  from declawing cats to practicing euthanasia.
Like you, I would resist euthanasia if there was another way to keep your other
  dogs safe.
Some groups fear this trend could lead to widespread euthanasia.
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