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From The Collaborative International Dictionary of English v.0.48:
Gyroidal \Gy*roid"al\ (j[-i]*roid"al), a. [Gr. gy^ros circle + -oid + -al.] 1. Spiral in arrangement or action. [1913 Webster] 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. [1913 Webster] 3. (Opt.) Turning the plane of polarization circularly or spirally to the right or left. [1913 Webster]