euthanasia

noun3

1. •
   The practice of intentionally killing a human being or animal in a humane way, especially in order to end suffering.

   • Euthanasia is the most difficult part of a veterinarian's job.
2. •
   (euphemistic) The practice of killing a human being who is considered a liability to society, especially a disabled person.
3. •
   (no longer used) An easy death, or the means to bring about such a death.

   • For myself I could hold it in my account with God to find such an euthanasia for you, even at this moment if it were best. — 1897