Definition of "hemlock"

Any of the poisonous umbelliferous plants, of the genera

1. Conium, either Conium maculatum or Conium chaerophylloides.  quotations  examples

   Quotations

   • Have a tree or two the witches particularly like, such as the alder, larch, cypress and hemlock; then, to counteract any possible evil effects, there must be a holly, yew, hazel, elder, mountain ash or juniper.

     1940, Rosetta E. Clarkson, Green Enchantments: The Magic Spell of Gardens, The Macmillan Company, page 273

   • There were bunches of wild garlic to keep out evil spirits, foxgloves for healing spells and hemlock and vervain for darker magic.

     1971, Richard Carpenter, Catweazle and the Magic Zodiac, Harmondsworth: Puffin Books, page 41

2. Cicuta, water hemlock plant.  examples

The poison obtained from these Conium and Cicuta plants.  examples

Any of several coniferous trees, of the genus Tsuga, that grow in North America; the wood of such trees.  quotations  examples