Definition of coniine in US English:



  • A volatile poisonous compound found in hemlock and other plants. It affects the motor nerves, causing paralysis and asphyxia.

    An alkaloid, 2-propylpiperidine; chemical formula: C₈H₁₇N

    • ‘They include poisons such as nicotine, coniine, and strychnine.’
    • ‘It is the poison coniine that produces the flying effect.’
    • ‘Other alkaloids that have been identified in hemlock are methyl coniine, ethyl piperidine and pseudoconhydrine.’
    • ‘Like Homo sapiens, animals take important cues from smell and know to stay away from flowers like the dreaded Douglas water hemlock, whose broad white blossoms contain coniine, which is deadly.’
    • ‘If coniine is a secondary amine, what is its structure?’


Mid 19th century: from Latin conium (from Greek kōneion ‘hemlock’) + -ine.