a hormone or neurotransmitter, C8H11NO3, related to epinephrine, that is used medically to constrict blood vessels and to stop bleeding: it is secreted by the adrenal medulla or liberated at nerve endings to help transmit nerve impulses
Word origin
see nor-
Examples of 'norepinephrine' in a sentence
norepinephrine
I'm a catecholamine man myself: it's norepinephrine which does it -- that's a breakdown of tyrosine.
Fay Weldon THE PRESIDENT'S CHILD (2003)
The messenger molecules tell those cells: `Hey, give our friend here a shot of dopamine or norepinephrine.