prescriber noun2 •A person who prescribes medication (usually a physician, physician assistant, or nurse practitioner).[…] the law made New Hampshire the first state to try to block pharmaceutical companies’ hard-sell pitches by restricting access to data that identifies doctors and other prescribers. — 2007 •One who directs or orders, as for example one who makes prescriptive demands on others' use of language. formsprescribers