Epinephrine, also known as adrenaline, is a hormone and a medication. The names "adrenaline" and "epinephrine" come from the Latin words "ad"-+"renes" and the Greek words "epi"-+"nephros." Both mean "into or onto the kidney" (adrenaline is made in the adrenal glands, which sit on top of the kidneys). In medical jargon, epinephrine is shortened to just "epi" (pronounced eh-pee).