conium

noun

co·​ni·​um kō-ˈnī-əm  ˈkō-nē- 

1

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

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