/ Dictionary / Index B Bosporus: Meaning and Definition of Find definitions for: Bos•po•rus Pronunciation: (bos'pur-us), [key] — n. a strait connecting the Black Sea and the Sea of Marmara. 18 mi. (29 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bosporus (Thesaurus) boson bosquet Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language