noun
a poisonous alkaloid found in aconite plants, used medicinally as a sedative and analgesic
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Aconitia is a highly toxic alkaloid found in plants of the genus Aconitum.
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I heard aconitia is really poisonous, so be careful around those plants.
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Stay away from that aconitia stuff, it's no joke.
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His words were like aconitia, poisoning the minds of those who listened.