Gyroidal /(jī̇*roid"al)/

Gy·roid·al

Gyroidal

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