/ Dictionary / Index B bisectrix: Meaning and Definition of Find definitions for: bi•sec•trix Pronunciation: (bī-sek'triks), [key] — pl. bi•sec•tri•ces an imaginary line bisecting either the acute angleor the obtuse angleof the optic axes of a biaxial crystal. a bisector. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bisector bisellium 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