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Ancient Greek


gyroidal (not comparable)

  1. Spiral in arrangement or action.
  2. (crystallography) Having the planes arranged spirally, so that they all incline to the right (or left) of a vertical line; said of certain hemihedral forms.
  3. Turning the plane of polarization circularly or spirally to the right or left.

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for gyroidal in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)