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eupatorium

[yoo-puh-tawr-ee-uh m, -tohr-]
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noun
  1. any of numerous composite plants of the genus Eupatorium, having flat-topped clusters of flowers and comprising the bonesets or thoroughworts.
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Origin of eupatorium

1570–80; < New Latin < Greek eupatṓrion hemp agrimony, after Eupátōr surname of Mithridates, said to have first used it
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for eupatorium

eupatorium

noun
  1. any plant of the genus Eupatorium, of N temperate regions and tropical America: cultivated for their ornamental clusters of purple, pink, or white flowers: family Asteraceae (composites)
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Word Origin

C16: from New Latin, from Greek eupatorion hemp agrimony, from Eupator surname of Mithridates VI, king of Pontus and traditionally the first to have used it medicinally
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012