Having or containing the centre of something.
Being in the centre.
Exerting its action towards the peripheral organs.
Being very important, or key to something.
centre
Of, or relating to, the navel (umbilicus) or the umbilical cord.
Such that the curvatures of normal sections are all equal to each other.
A cord connecting an astronaut to a spacecraft, or a craft to ground control prior to launch, etc.