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noun co·ni·um \kō-ˈnī-əm, ˈkō-nē-\

Medical Definition of conium

  1. 1a capitalized :  a genus of poisonous herbs (family Umbelliferae) that have spotted stems, large divided leaves and white flowers and that include the poison hemlockb:  a plant of the genus Conium

  2. 2:  the dried full-grown but unripe fruit of the poison hemlock containing coniine and its methyl derivative and used as a narcotic and sedative

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