n. (Bot.) A poisonous umbelliferous plant; in England, the Cicuta virosa; in the United States, the Cicuta maculata and the Archemora rigida. See Water hemlock. [ 1913 Webster ]
(n) tall biennial water hemlock of northeastern North America having purple-spotted stems and clusters of extremely poisonous tuberous roots resembling small sweet potatoes, Syn. spotted hemlock, spotted water hemlock