/ Dictionary / Index B big top: Meaning and Definition of Find definitions for: big' top" Pronunciation: [key] the largest or main tent of a circus. a circus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. big toe big tree Related Content Daily Word Quiz: boorish Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language