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.

1900–05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Stability of two-fold screw axis structures for cellulose.
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