Conium

noun

1. The poison hemlock.
2. A genus of umbelliferous plants, consisting of tall glabrous biennial herbs, with compound leaves and white-flowered umbels.
3. A genus of biennial, poisonous, white-flowered, umbelliferous plants, bearing ribbed fruit (“seeds”) and decompound leaves.
4. The common hemlock (Conium maculatum, poison hemlock, spotted hemlock, poison parsley), a roadside weed of Europe, Asia, and America, cultivated in the United States for medicinal purpose. It is an active poison. The leaves and fruit are used in medicine.
5. Any of the genus Conium of poisonous perennial herbaceous flowering plants.