Pronunciation: (pri-skrip'shun),[key] —n. 1. Med. a. a direction, usually written, by the physician to the pharmacist for the preparation and use of a medicine or remedy.
b. the medicine prescribed: Take this prescription three times a day. 2. an act of prescribing.
3. that which is prescribed.
4. Law. a. a long or immemorial use of some right with respect to a thing so as to give a right to continue such use.
b. the process of acquiring rights by uninterrupted assertion of the right over a long period of time.
—adj. (of drugs) sold only upon medical prescription; ethical. Cf. over-the-counter (def. 2).