co·ni·um noun \kō-ˈnī-əm, ˈkō-nē-\
a capitalized : a genus of poisonous herbs (family Umbelliferae) that have spotted stems, large divided leaves and white flowers and that include the poison hemlock b : a plant of the genus Conium
: 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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