heroin
n.
a morphine derivative, diacetyl morphine , used to relieve severe pain and as a sedative. It is highly addictive, and its use is strictly controlled in the U.S. by federal law. It is a popular strong narcotic drug of abuse, in part because it is more soluble than morphine. It is sometimes included as one of the components of Brompton's mixture , used to control pain in terminallly ill patients.
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