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- An extremely addictive narcotic drug derived from morphine.
- An illicit (in the United States) opioid synthesized from morphine.
Heroin, a white or brown powder, is injected intravenously and is the most
commonly abused narcotic.
Source: Edgerton, Jane E. 1994. American Psychiatric Glossary, 7th Edition. Washington, DC: American Psychiatric Press
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