Noun hemlock has 4 senses
  1. hemlock - poisonous drug derived from an Eurasian plant of the genus Conium; "Socrates refused to flee and died by drinking hemlock"
    --1 is a kind of
    plant toxin, phytotoxin
  2. hemlock, poison hemlock, poison parsley, California fern, Nebraska fern, winter fern, Conium maculatum - 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
    --2 is a kind of poisonous plant
    --2 is a member of Conium, genus Conium
  3. hemlock - soft coarse splintery wood of a hemlock tree especially the western hemlock
    --3 is a kind of
    wood
    --3 is a substance of hemlock, hemlock tree
  4. hemlock, hemlock tree - an evergreen tree
    --4 is a kind of conifer, coniferous tree
    --4 is a member of Tsuga, genus Tsuga
    --4 has substances: hemlock
    --4 has particulars:
     eastern hemlock, Canadian hemlock, spruce pine, Tsuga canadensis; Carolina hemlock, Tsuga caroliniana; mountain hemlock, black hemlock, Tsuga mertensiana; western hemlock, Pacific hemlock, west coast hemlock, Tsuga heterophylla
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