Norepinephrin — [nawr-ep-uh-nef-rin, -reen]
- 1. Also called noradrenaline. Physiology. a neurotransmitter, released by adrenergic nerve terminals in the autonomic and possibly the central nervous system, that has such effects as constricting blood vessels, raising blood pressure, and dilating bronchi.
- 2. Pharmacology. a commercial form of this substance used for emergency treatment of lowered blood pressure.