/ Dictionary / Index B besom: Meaning and Definition of Find definitions for: be•som Pronunciation: (bē'zum), [key] — n. a broom, esp. one of brush or twigs. broom (def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: besom (Thesaurus) besmirch besom pocket 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