/ Dictionary / Index B Bissau: Meaning and Definition of Find definitions for: Bis•sau Pronunciation: (bi-sou'), [key] — n. a seaport in and the capital of Guinea-Bissau, in the W part. 75,000. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bissau (Thesaurus) bisque bissextile 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