hemlock /ˈhɛmˌlɒk/ noun5 •Any of the poisonous umbelliferous plants, of the genera •Conium, either Conium maculatum or Conium chaerophylloides.There were bunches of wild garlic to keep out evil spirits, foxgloves for healing spells and hemlock and vervain for darker magic. — 1971 •Cicuta (water hemlock). •Any of several coniferous trees, of the genus Tsuga, that grow in North America; the wood of such trees.The wind blows and the hemlocks wave their feathery leading shoots. Such a graceful profile, so elegant a tree. — 2018 •Poison obtained from these Conium and Cicuta plants. formshemlocks