Final answer:
Physician-assisted (PAS) is the term used when a doctor prescribes a lethal dose of medication for a terminal patient to assist them in ending their own life.
Step-by-step explanation:
When a doctor prescribes a lethal dose of medication for a terminal patient, it is called physician-assisted (PAS). PAS refers to the practice in which a physician provides the means, such as a prescription for a lethal dose of medication, to assist a patient in ending their own life. This practice is controversial and has been legalized in some states in the United States as well as in other countries.