Definify.com
Webster 1913 Edition
Gyroidal
Gy-roid′al
(jī̍-roid′al)
, Adj.
[Gr.
γῦροσ
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.