living will

from WordNet (r) 3.0 (2006)

living will
    n 1: a document written by someone still legally capable
         requesting that he should be allowed to die if subsequently
         severely disabled or suffering terminal illness; "after he
         discovered he had AIDS he drew up a living will"

from The Collaborative International Dictionary of English v.0.48

living will \liv"ing will\
   A document signed by an individual expressing his/her desire
   that, in the event of an illness from which there is no
   reasonable expectation of recovery, aggressive or
   extraordinary measures to prolong life, such as resuscitation
   and life-support equipment, should not be used.
   [PJC]