Original sentence: Euthanasia (from Greek: ευθανασία -ευ, eu, "good", θάνατος, thanatos, "death") is the practice of terminating the life of a person or animal in a presumably painless or minimally painful way, usually by lethal injection
Edited sentence: Euthanasia (from Greek: ευθανασία -ευ, eu, "good", θάνατος, thanatos, "death") is the practice of terminating the life of a terminally ill person or animal in a minimally painful way, for the purpose of limiting further suffering