n.
Pronunciation: ' no ̇ r- ˌ e-p ə - ' ne-fr ə n
Function: noun
Date: 1945
: a monoamine C 8 H 11 NO 3 that is a neurotransmitter in postganglionic neurons of the sympathetic nervous system and in some parts of the central nervous system, is a vasopressor hormone of the adrenal medulla, and is a precursor of epinephrine in its major biosynthetic pathway