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- pronunciation:
- o
pi
oId
| part of speech: |
noun |
| definition 1: |
any natural or synthetic compound, including heroin, morphine, and certain prescription pain relievers, that binds opioid receptors and has an analgesic or narcotic effect.
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| definition 2: |
any natural or synthetic drug that is structurally similar to opium and has a similar effect.
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