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rotation-inversion axis

[roh-tey-shuh n in-vur-zhuh n, -shuh n]
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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.
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Also called symmetry axis of rotary inversion.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018