A toxic alkaloid compound found in or associated with hemlock or other poisonous plants, or a historical chemical term for an unidentified plant substance.
From cony plus -ine (an alkaloid suffix), or possibly from Greek konion 'hemlock.' The term emerged in 19th-century toxicology when researchers tried to isolate and name poisonous compounds from various plants.
Conyrine is probably a 'ghost word'—a term that got printed in chemistry texts, copied by later researchers, and became 'real' even though the compound may never have been properly identified, showing how scientific misinformation can live for decades before anyone notices.
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