bisectrix

English

Noun

bisectrix (plural bisectrixes or bisectrices)

  1. (crystallography) The line bisecting the angle between the optic axes of a biaxial crystal.
    acute bisectrix
    • 1911, Microcline, Encyclopædia Britannica:
      In a section parallel to the basal plane c (001) of a microcline crystal the lamellae do not extinguish optically parallel to the edge bc as in orthoclase, but at an angle of 15° 30′; further, the obtuse bisectrix of the optic axes in microcline is inclined to the normal of the plane b (010) at an angle of 15° 26

References

Latin

Etymology

From bi- +‎ secō +‎ -trīx. Coined in New Latin as a feminine agent noun corresponding to the masculine bisector.

Pronunciation

Noun

bisectrīx f (genitive bisectrīcis); third declension

  1. (New Latin, geometry) bisector; a line or plane that bisects an angle or line segment.
    • 1825, C. F. A. Jacobi, De triangulorum rectilineorum proprietatibus, Berlin: Typis A. W. Schadii, page 3:
      Sint AP, BQ, CR bisectrices angulorum A, B, C, et AQ', BR', CP' bisectrices angulorum externorum.
      Let AP, BQ, CR be the bisectors of angles A, B, C, and [let] AQ', BR', CP' [be] the bisectors of the external angles.

Declension

Third-declension noun.

singular plural
nominative bisectrīx bisectrīcēs
genitive bisectrīcis bisectrīcum
dative bisectrīcī bisectrīcibus
accusative bisectrīcem bisectrīcēs
ablative bisectrīce bisectrīcibus
vocative bisectrīx bisectrīcēs
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