Hemlock
WordNet
noun
(1) An evergreen tree
(2) Soft coarse splintery wood of a hemlock tree especially the western hemlock
(3) Large branching biennial herb native to Eurasia and Africa and adventive in North America having large fernlike leaves and white flowers; usually found in damp habitats; all parts extremely poisonous
(4) Poisonous drug derived from an Eurasian plant of the genus Conium
"Socrates refused to flee and died by drinking hemlock"