/ Dictionary / Index B bisellium: Meaning and Definition of Find definitions for: bi•sel•li•um Pronunciation: (bī-sel'ē-um), [key] — pl. -sel•li•a an ancient Roman seat of honor for two persons. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bisectrix biserial 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