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).
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