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From The Collaborative International Dictionary of English v.0.48:
Aconite \Ac"o*nite\, n. [L. aconitum, Gr. ?: cf. F. aconit.] 1. (Bot.) The herb wolfsbane, or monkshood; -- applied to any plant of the genus Aconitum (tribe Hellebore), all the species of which are poisonous. [1913 Webster] 2. An extract or tincture obtained from Aconitum napellus, used as a poison and medicinally. [1913 Webster] Winter aconite, a plant (Eranthis hyemalis) allied to the aconites. [1913 Webster]