euthanasia
... This is where euthanasia comes into play. Webster’s Dictionary defines euthanasia as the deliberate, painless killing of persons who suffer from a painful and incurable disease or condition, or who are aged and helpless. And, the word euthanasia itself is derived from two Greek words eu and thanatos, meaning “good death” or “happy death”. ... The big difference between suicide and euthanasia is that with euthanasia someone other than the person that is dying is involved. ... Doctors that practice euthanasia defend themselves and medicine by saying, that when the level of pain and suffering no longer permits human functioning it is not unethical for a physician to end a life when suffering allows no further participation in life.