/ Dictionary / Index E eupatorium: Meaning and Definition of Find definitions for: eu•pa•to•ri•um Pronunciation: (y"pu-tôr'ē-um, -tōr'-), [key] — n. any of numerous composite plants of the genus Eupatorium, having flat-topped clusters of flowers and comprising the bonesets or thoroughworts. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: eupatorium (Thesaurus) euonymus eupatrid Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language