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rotation-inversion axis

[roh-tey-shuh n in-vur-zhuh n, -shuh n] /roʊˈteɪ ʃən ɪnˈvɜr ʒən, -ʃən/
noun, Crystallography.
an axis of a crystal such that rotating about the axis and then inverting the crystal brings the crystal back to its original position.
Also called symmetry axis of rotary inversion.
Compare symmetry element. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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