• WordNet 3.6
    • n wolfsbane poisonous Eurasian perennial herb with broad rounded leaves and yellow flowers and fibrous rootstock
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Webster's Revised Unabridged Dictionary
    • n Wolfsbane (Bot) A poisonous plant (Aconitum Lycoctonum), a kind of monkshood; also, by extension, any plant or species of the genus Aconitum. See Aconite.
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Century Dictionary and Cyclopedia
    • n wolfsbane A. plant of the genus Aconitum; aconite or monk's-hood; specifically, A. lycoctonum, the yellow or yellow-flowered wolf's bane, also called badger's-, bear's-, or hare's-bane. It is found widely in Europe, especially in mountains. Its greenish-yellow flowers have the hood developed like an extinguisher; its poison is less virulent than that of other species.
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In literature:

There was the awesome efficiency of wolfsbane with its deadly store of aconite.
"The Status Civilization" by Robert Sheckley
For his destruction Medea mingles the wolfsbane, which she once brought with her from the shores of Scythia.
"The Metamorphoses of Ovid" by Publius Ovidius Naso
It was wolfsbane did it good, beat up in water quite fine.
"When Ghost Meets Ghost" by William Frend De Morgan