the.com/epinephrine

means A hormone and medication that rapidly tightens blood vessels, speeds the heart, and opens airways, used by the body to trigger fight-or-flight and used by medicine to reverse severe allergic reactions and cardiac arrest.

from Built from Greek epi- ('upon') and nephros ('kidney'), since the adrenal glands that produce it sit right on top of the kidneys. It's essentially a direct translation of 'adrenaline' (ad- + renes, Latin for 'kidney'), coined separately by scientists working in Greek-rooted versus Latin-rooted medical vocabulary — which is why the same molecule ended up with two names, one favored in American medicine (epinephrine) and one in everyday British English (adrenaline).