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]

The Collaborative International Dictionary of English v.0.48:

Eranthis \Eranthis\ prop. n.
   A genus of plants of the buttercup family including the
   winter aconite, Eranthis hyemalis.

   Syn: genus Eranthis.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

winter aconite
    n 1: small Old World perennial herb grown for its bright yellow
         flowers which appear in early spring often before snow is
         gone [syn: winter aconite, Eranthis hyemalis]