Definition of "epinephrine"
epinephrine
/ɛpɪˈnɛfɹɪn/
noun
countable and uncountable, plural epinephrines
(biochemistry, organic chemistry, medicine) A catecholamine hormone and neurotransmitter; as a hormone, secreted by the adrenal gland in response to stress (when it stimulates the autonomic nervous system); as a neurotransmitter, synthesized from norepinephrine. It is also used as a medication.