rotation-inversion axis

[ roh-tey-shuhn in-vur-zhuhn, -shuhn ]
/ 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.

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What does “clement” mean?
Also called symmetry axis of rotary inversion.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020