Gyroidal
Gyroidal (ji*roid"al) , adjective
[Greek gy^ros circle + -oid + -al.]
1.
Spiral in arrangement or action.
2.
(Crystallography) Having the planes arranged spirally, so that they incline all to the right (or left) of a vertical line; -- said of certain hemihedral forms.
3.
(Optics) Turning the plane of polarization circularly or spirally to the right or left.