obtuse bisectrix
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obtuse bisectrix — noun : the bisectrix of the obtuse angle formed by the axes of a biaxial crystal called also second mean line * * * Crystall. See under bisectrix (def. 1). [1895 1900] … Useful english dictionary
bisectrix — /buy sek triks/, n., pl. bisectrices /buy sek truy seez/. 1. Crystall. an imaginary line bisecting either the acute angle (acute bisectrix) or the obtuse angle (obtuse bisectrix) of the optic axes of a biaxial crystal. 2. Geom. a bisector. [1850… … Universalium
second mean line — noun see obtuse bisectrix … Useful english dictionary
