gyroidal

Century Dictionary and Cyclopedia

1. Spiral in arrangement or in movement. In crystallography, having certain planes arranged spirally, so that they incline all to the right or all to the left of a vertical line.

Wiktionary

1. adj. Spiral in arrangement or action.
2. adj. 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. adj. Turning the plane of polarization circularly or spirally to the right or left.

GNU Webster's 1913

1. adj. Spiral in arrangement or action.
2. adj. (Crystallog.) 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. adj. (Opt.) Turning the plane of polarization circularly or spirally to the right or left.