American Heritage® Dictionary of the English Language, Fourth Edition
- n. A deadly poisonous European plant (Conium maculatum) widely naturalized in North America, having bipinnately compound leaves and compound umbels of small white flowers.
GNU Webster's 1913
- n. (Bot.) a poisonous umbelliferous plant (Conium maculatum). See Hemlock.
- n. 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
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