/ Dictionary / Index B bosun: Meaning and Definition of Find definitions for: bo•sun Pronunciation: (bō'sun), [key] — n. boatswain. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bosun (Thesaurus) Boston terrier bosun bird Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language