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  1. Oxford American Dictionary

    polar axis

    • IPA[ˌpōlər ˈaksəs]

    美式

    • n.
      the axis of an equatorially mounted telescope which is at right angles to the declination axis and parallel to the earth's axis of rotation, about which the telescope is turned to follow the apparent movement of celestial objects resulting from the earth's rotation.

    • noun: polar axis, plural noun: polar axes