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polar axis

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polar axis [′pō·lər ′ak·səs]
(crystallography)
An axis of crystal symmetry which does not have a plane of symmetry perpendicular to it.
(mathematics)
The directed straight line relative to which the angle is measured for a representation of a point in the plane by polar coordinates.


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This type of mounting has to be set up with polar axis pointing to the north celestial pole.
Fiennes, who has made the first surface journey around the world's polar axis (don't ask me why), will guide the other two on a week-long trek to the Arctic Circle.
The first rhizoid was formed by the first division parallel or near parallel to the spore polar axis (Figs.
 
 
 
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