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rotation axis

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noun Crystallography.
  1. an imaginary line through a crystal about which the crystal may be rotated a specified number of degrees and be brought back to its original position.
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Origin of rotation axis

First recorded in 1900–05
Also called axis of symmetry, symmetry axis of rotation.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018