/ Dictionary / Index B bisector: Meaning and Definition of Find definitions for: bi•sec•tor Pronunciation: (bī-sek'tur, bī'sek-), [key] — n. Geom. a line or plane that bisects an angle or line segment. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bisect bisectrix 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