the fixed line, usually horizontal, from which the angle made by the radius vector is measured in a polar coordinate system.
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How to use polar axis in a sentence
The same would be the case if the polar axis of one sphere stood precisely at right angles to that of the other.
Thus the wide habitability of the earth is an effect arising from the inclination of its polar axis.
Let us conceive a particle of air situated immediately over the earth's polar axis.
The errors of the polar axis were finally reduced to within the limits of error of observation.Photographs of Nebul and Clusters | James Edward Keeler
The declination axis is short, and is supported by a massive goose-neck bolted to the upper end of the polar axis.Photographs of Nebul and Clusters | James Edward Keeler
British Dictionary definitions for polar axis
the fixed line in a system of polar coordinates from which the polar angle, θ, is measured anticlockwise
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012