Poison hemlock Meaning, Definition & Usage

  1. noun 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
    poison parsley; hemlock; Nebraska fern; Conium maculatum; California fern; winter fern.

WordNet

Definitions
  1. (Bot.), a poisonous umbelliferous plant (Conium maculatum). See Hemlock.

Webster 1913