conium
noun
co·ni·um
| \ kō-ˈnī-əm
, ˈkō-nē-
\
, ˈkō-nē-
\
Medical Definition of conium
1a
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