Which term refers to a physician's directive that specifies an individual's end-of-life wishes?

The correct term that refers to a physician's directive specifying an individual's end-of-life wishes is an advance directive. This is a legal document that outlines a person's preferences for medical treatment in situations where they might be unable to communicate their decisions themselves, particularly regarding life-sustaining treatments. Advance directives can encompass various instructions about the type of medical care a person wishes to receive or not receive as they approach the end of life.

While a living will is indeed a type of advance directive that specifically details the medical treatments a person wishes or does not wish to receive, the broader term encompasses not just living wills but also other forms of directives. Thus, advance directive is the more comprehensive answer.

The power of attorney is a separate legal concept that gives someone authority to make financial or legal decisions on another person's behalf but does not inherently include healthcare decisions unless it specifically grants that authority. Similarly, a healthcare proxy designates an individual to make medical decisions for someone else, which can be part of the broader framework of advance directives, but does not encompass all end-of-life wishes as thoroughly as an advance directive does.