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Webster 1913 Edition

Noun.

One who prescribes.

Noun.

One that prescribes.

prescriber ‎(plural prescribers)

A person, such as a physician, who prescribes medication
- 2007 May 1, The Associated Press, “Prescription-Writing Law Is Voided”, in New York Times:
  […] 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.

a person who prescribes medication