noun
a drug or other substance affecting mood or behavior and sold for nonmedical purposes, especially an illegal one
adjective
relating to or denoting narcotics or their effects
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The doctor prescribed a narcotic painkiller to manage the patient's post-operative pain.
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I heard that some people abuse narcotics to get high.
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I can't believe he's still hooked on that narcotic stuff.
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Her love for him was like a narcotic, addictive and all-consuming.