'living will' definitions:

Definition of 'living will'

From: WordNet
noun
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"

Definition of 'living will'

From: GCIDE
  • 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]