/ Dictionary / Index B butterbur: Meaning and Definition of Find definitions for: but•ter•bur Pronunciation: (but'ur-bûr"), [key] — n. any of several composite plants of the genus Petasites, having large, woolly leaves said to have been used to wrap butter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: butterbur (Thesaurus) butter brickle butter clam Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language