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hard drug any drug, such as heroin, that is addictive and causes long-term harmful effects.
horse (slang) heroin. [1/10 definitions]
jones (slang; sometimes cap.) an addiction, esp. to heroin.
junk1 (slang) heroin, or another narcotic. [1/5 definitions]
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]
shit (slang) a narcotic, esp. heroin or marijuana. [1/11 definitions]
smack4 (slang) heroin.
snow (slang) heroin or cocaine. [1/8 definitions]
snowbird (slang) a heroin or cocaine addict. [1/3 definitions]
speedball (slang) a mixture of cocaine and heroin or morphine, usu. injected. [1/2 definitions]