GYRODUS
Gyr"o*dus, n. Etym: [NL., fr. Gr. (Paleon.)
Defn: A genus of extinct oölitic fishes, having rounded teeth in several rows adapted for crushing.
GYROGONITE
Gy*rog"o*nite, n. Etym: [Gr. (Paleon.)
Defn: The petrified fruit of the Chara hispida, a species of stonewort. See Stonewort. Lyell.
GYROIDAL
Gy*roid"al, a. Etym: [Gr. -oid + -al.]
1. Spiral in arrangement or action.
2. (Crystallog.)
Defn: 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.)
Defn: Turning the plane of polarization circularly or spirally to the right or left.