GYROIDAL

Etymology

Adjective

gyroidal (not comparable)

Spiral in arrangement or action.

(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.

Turning the plane of polarization circularly or spirally to the right or left.

Source: Wiktionary

Gy*roid"al, a. Etym: [Gr. -oid + -al.]

1. Spiral in arrangement or action.

2. (Crystallog.)

Definition: 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. (Opt.)

Definition: Turning the plane of polarization circularly or spirally to the right or left.

Source: Webster’s Unabridged Dictionary 1913 Edition