Aconite

Part of speech: noun (n.)

1. The herb wolfsbane, or monkshood; -- applied to any plant of the genus Aconitum (tribe Hellebore), all the species of which are poisonous.

2. An extract or tincture obtained from Aconitum napellus, used as a poison and medicinally. Winter aconite, a plant (Eranthis hyemalis) allied to the aconites.