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screw axis

noun, Crystallography
a symmetry element of a space group such that a rotation of the lattice about the axis and a translation of the lattice some fraction of the lattice's unit distance brings the lattice back to its original position.
Origin of screw axis
1900-05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for screw axis
  • Stability of two-fold screw axis structures for cellulose.

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