Entry 1 sense Webster, 1913 Cicuta · Ci·cu·ta · IPA /sɪˈkjuːtə/ 01 n. a genus of poisonous umbelliferous plants, of which the water hemlock or cowbane is best known. 1. a genus of poisonous umbelliferous plants, of which the water hemlock or cowbane is best known.(Bot.)