|nȯr+ noun
Etymology: nor- + epinephrine
: a crystalline compound (HO) 2 C 6 H 3 CH(OH)CH 2 NH 2 that occurs in the levoratatory form as a hormone with epinephrine and that has a strong vasoconstrictor action and mediates transmission of sympathetic nerve impulses but lacks or exhibits weakly most other epinephrine effects (as on cardiac output or blood-sugar concentration) — called also arterenol, noradrenaline ; compare sympathin