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obtuse bisectrix

noun
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Definition of obtuse bisectrix

: the bisectrix of the obtuse angle formed by the axes of a biaxial crystal

— called also second mean line

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“Obtuse bisectrix.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/obtuse%20bisectrix. Accessed 10 Jul. 2020.

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