heroin

her·o·in

noun \ˈher-ə-wən, ˈhe-rə-\

: a powerful illegal drug that is made from morphine

Full Definition of HEROIN

:  a strongly physiologically addictive narcotic C₂₁H₂₃NO₅ that is made by acetylation of but is more potent than morphine and that is prohibited for medical use in the United States but is used illicitly for its euphoric effects

— her·o·in·ism \-wə-ˌni-zəm\ noun

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Origin of HEROIN

from Heroin, a trademark

First Known Use: 1898

her·o·in

noun \ˈher-ə-wən\   (Medical Dictionary)

Medical Definition of HEROIN

: a strongly physiologically addictive narcotic C₂₁H₂₃NO₅ that is made by acetylation of but is more potent than morphine and that is prohibited for medical use in the United States but is used illicitly for its euphoric effects—called also acetomorphine, diacetylmorphine, diamorphine

heroin

noun    (Concise Encyclopedia)

Heterocyclic compound, a highly addictive alkaloid derivative of morphine (chemically, it is diacetylmorphine) that makes up a large portion of illicit narcotics traffic. Easily made from morphine, it was developed and first used as an analgesic, but its undesirable effects outweighed its value, and it is illegal in most countries. Injection brings an ecstatic, warm, glowing sensation, followed by relaxation and contentment. Within half a day withdrawal symptoms set in, with a craving for more. Development of tolerance, requiring ever greater amounts for the same effects, leads to drug addiction. Illegal street heroin is usually only 2–5% pure; unwitting injection of relatively pure heroin is a major cause of overdose, resulting in depressed respiration, coma, and death.