For Opiate we have terms and definitions in 2 topics. The topics are Addiction and HIV and AIDs.

Any substance, natural or synthetic, that is related in action to morphine and binds to the same, or some of the same, receptors. Some writers use it just to mean opium, morphine, codeine, and heroin - the natural ingredients of the poppy and their derivatives, excluding the synthetic narcotic analgesics.
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A natural or synthetic derivative of opium that has similar ANALGESIC and sedative effects.
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