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Mosby's Medical Dictionary (9th Edition, 2009) defines 'euthanasia' as: "1. also called mercy killing. the deliberate causing of the death of a person who is suffering from an incurable disease or condition. It may be active, such as by administration of a lethal drug, or passive, such as by withholding of treatment. Legal authorities, church leaders, philosophers, and commentators on ethics and morality usually _______________ passive euthanasia from active euthanasia. 2. an easy, quiet, painless death."