Wa·ter hem·lock Bot (a) A poisonous umbelliferous plant (Cicuta virosa) of Europe; also, any one of several plants of that genus. (b) A poisonous plant (Œnanthe crocata) resembling the above.
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water hemlock
n : tall erect highly poisonous Eurasiatic perennial herb
locally abundant in marshy areas [syn: Cicuta verosa]