noun

• (biochemistry) An oxidation product of adrenaline or epinephrine; its semicarbazone is used as a drug to reduce bleeding.
  "Investigation of the chemical constitution showed that it has the properties of N-methyl-2:3-dihydro-3-hydroxyindole-5:6-quinone. The shorter name adrenochrome is proposed for this substance. […] Adrenochrome is a very unstable substance: it is completely destroyed in 4 min. by 1% hydrochloric acid, and in 40 sec. by 1% ammonia."
• (fiction) A fictional drug obtained from human adrenal glands.
  "“[…]He's one of these Satanism freaks. He offered me human blood—said it would make me higher than I'd ever been in my life,” he laughed. “I thought he was kidding, so I told him I'd just as soon have an ounce or so of pure adrenochrome—or maybe just a fresh adrenalin gland to chew on.”"