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rotation-inversion axis

[roh-tey-shuh n in-vur-zhuh n, -shuh n] /roʊˈteɪ ʃən ɪnˈvɜr ʒən, -ʃən/
noun, Crystallography
1.
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.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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