Ac·o·nite n.
  1. Bot. 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.
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  Aconitum napellus
       n : a poisonous herb native to northern Europe having hooded
           blue-purple flowers; the dried leaves and roots yield
           aconite [syn: monkshood, helmetflower, helmet flower]