- The definition of adrenaline is a hormone that causes your heart rate to speed up and gives you more energy.
Epinephrine is an example of adrenaline.
From adrenal +"Ž -ine.
Variant of Adrenalin
Origin of Adrenalinadrenal + -in: so named (1901) by J. Takamine, United States chemist who first isolated ittrademark for epinephrine
epinephrine: often used figuratively