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symmetry axis of rotation

noun, Crystallography

rotation axis

noun, Crystallography
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.
Also called axis of symmetry, symmetry axis of rotation.
Compare symmetry element.
Origin of rotation axis
1900-05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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