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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ratsbane (n.)

"rat poison, arsenic," 1520s; see rat (n.) + bane. Compare henbane, fleabane, wolfsbane.

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aconite (n.)

poisonous plant (also known as monkshood and wolfsbane), 1570s, from French aconit (16c.), from Latin aconitum, from Greek akoniton, which is of unknown origin. The highly poisonous alkaloid in it, once isolated, was named aconitine (1826).

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