orthothanasia

or·tho·tha·na·si·a

(ōr'thō-thă-nā'zē-ă),
1. A normal or natural manner of death and dying.
2. Sometimes used to denote the deliberate stopping of artificial or heroic means of maintaining life.
[ortho- + G. thanatos, death]

orthothanasia

(1) Natural death. 
(2) Passive euthanasia, see there.