Bible Dictionaries
Yroidal
Webster's Dictionary
(1):
(a.) Turning the plane of polarization circularly or spirally to the right or left.
(2):
(a.) 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):
(a.) Spiral in arrangement or action.
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Bibliography Information
Webster, Noah. Entry for 'Yroidal'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/y/yroidal.html. 1828.