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| o·pi·oid [ ṓpee òyd ] |
noun (plural o·pi·oids) |
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| Definition: |
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naturally occurring opium-containing substance: any opium-containing substance that is produced naturally in the brain
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adjective |
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| Definition: |
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similar to opium: similar in effect or properties to opium but not derived from opium
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| [Mid-20th century. <opium] |
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