- any plant belonging to the genus Aconitum, of the buttercup family, having irregular flowers usually in loose clusters, including species with poisonous and medicinal properties.
- any of various N temperate plants of the ranunculaceous genus Aconitum, such as monkshood and wolfsbane, many of which are poisonous
- the dried poisonous root of many of these plants, sometimes used as an antipyretic
