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Meaning of bisectrix

bi•sec•trix

Pronunciation: (bī-sek'triks), [key]
— pl. bi•sec•tri•ces
  1. an imaginary line bisecting either the acute angleor the obtuse angleof the optic axes of a biaxial crystal.
  2. a bisector.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.