Gy*roid"al (?), a. [Gr. circle + -oid + -al.]

1.

Spiral in arrangement or action.

2. 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. Opt.

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

 

© Webster 1913.

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