euthanasia -
An easy death, or the means to bring about such a death.
Wikipedia
Euthanasia refers to the practice of ending a life in a manner which relieves pain and suffering. According to the House of Lords Select Committee on Medical Ethics, the precise definition of euthanasia is "a deliberate intervention undertaken with the express intention of ending a life, to relieve intractable suffering. " Euthanasia is categorized in different ways, which include voluntary, non-voluntary, or involuntary and active or passive.
OmegaWiki Dictionary
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euthanasia The practice of ending the life of a person or an animal in a painless manner in order to prevent suffering.