a: any of several poisonous herbs (as a poison hemlock or a water hemlock) of the carrot family (Umbelliferae) having finely cut leaves and small white flowers b:conium 2
: a drug or lethal drink prepared from the poison hemlock—compare coniine
Any of 14 species of coniferous evergreen trees that make up the genus Tsuga, in the pine family, native to North America and central and eastern Asia. Some are important timber trees, and many are popular ornamentals. Other plants commonly called hemlock include ground hemlock (seeyew), poison hemlock, and water hemlock (parsley family). A true hemlock is a tall, pyramidal tree with purplish or reddish-brown bark, slender horizontal or drooping branches, and short, blunt leaves that grow from woody cushionlike structures on the twigs.