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: the dried poisonous tuberous root of a common monkshood (Aconitum napellus) used especially formerly for its medicinal properties (as in relieving pain)
: winter aconite
… they began planting one million daffodil, crocus, and aconite bulbs.— Walter Karp
1548, in the meaning defined at sense 1
borrowed from Middle French & Latin; Middle French, borrowed from Latin aconītum, borrowed from Greek akónīton, perhaps of pre-Greek substratal origin
The notion in late antiquity that the word was derived from Greek akonit́ī "without dust," hence, "without a struggle, effortless," referring to the efficacy of the poison, is fanciful.
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: the dried tuberous root of a monkshood (Aconitum napellus) formerly used as a cardiac and respiratory sedative
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to make faulty or ineffective
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