Etymology
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wolfsbane (n.)

"aconite" (especially Aconitum lycoctonum), a somewhat poisonous plant, 1540s, from wolf + bane; a translation of Latin lycoctonum, from Greek lykotonon, from lykos "wolf" + base of kteinein "to kill." Also known dialectally as badger's bane, hare's bane, bear's bane.

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Definitions of wolfsbane

wolfsbane (n.)
poisonous Eurasian perennial herb with broad rounded leaves and yellow flowers and fibrous rootstock;
Synonyms: wolfbane / wolf's bane / Aconitum lycoctonum
From wordnet.princeton.edu