/ Dictionary / Index B bellybutton: Meaning and Definition of Find definitions for: bel•ly•but•ton Pronunciation: (bel'ē-but"n), [key] — n. Informal. the navel. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bellybutton (Thesaurus) belly bust bellybutton surgery Related Content Daily Word Quiz: braggart Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language