The name of several poisonous umbelliferous herbs having finely cut leaves and small white flowers, as the Cicuta maculata, bulbifera, and virosa, and the Conium maculatum. See Conium.
- Any of various coniferous evergreen trees of the genus Tsuga of North America and eastern Asia, having small cones and short flat leaves with two white bands underneath.
- The wood of such trees, used as a source of lumber, wood pulp, and tannic acid.
- Any of several poisonous plants of the genera Conium and Cicuta, such as the poison hemlock.
- A poison obtained from the poison hemlock.