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hard drug any drug, such as heroin, that is addictive and causes long-term harmful effects.
jones (slang; sometimes cap.) an addiction, esp. to heroin.
junkie (informal) a drug addict, esp. a heroin addict. [1/2 definitions]
methadone a synthetic narcotic drug used in the treatment of heroin and morphine addiction and as a painkiller.
opioid any natural or synthetic compound, including heroin, morphine, and certain prescription pain relievers, that binds opioid receptors and has an analgesic or narcotic effect. [1/2 definitions]