Axial

[Sarah]

Belonging to the axis of the body; as, the axial skeleton; orto the axis of any appendage or organ; as, the axial bones. Axialline (Magnetism), the line taken by the magnetic force in passingfrom one pole of a horseshoe magnet to the other. Faraday.

[Merna]

relating to or around a real or imaginary straight line going through the centre of an object that is spinning, or a line that divides a symmetrical shape into two equal halves

[Britney]

Of, forming, or relating to an axis.