noun
1.
a. : a tall erect Eurasiatic perennial herb ( Cicuta virosa ) that is locally abundant in marshy areas or along streams and is highly poisonous
b. : any of several other plants of the genus Cicuta (as the American spotted cowbane)
2. : either of two water dropworts ( Oenanthe crocata and O. aquatica ) — compare water fennel