<p><strong>Noun</strong></p><ul><li>Also called noradrenaline</li><li>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</li><li>a commercial form of this substance used for emergency treatment of lowered blood pressure</li></ul>