What is Euthanasia? Euthanasia is defined by The American Heritage Dictionary as "the action of killing an individual for reasons considered to be merciful" (469). Here, killing is described as the physical action where one individual actively kills another. Euthanasia is tolerated in the medical field under certain circumstances when a patient is suffering profoundly and death is inevitable. The word "euthanasia" comes from the Greek eu, "good", and thanatos, "death," literally, "good death"; however, the word "euthanasia" is much more difficult to define. Each person may define euthanasia differently. Who is to decide whether a d