Reaching outward from a center — arranged like spokes; geometry that begins at a heart.
Latin radialis, from radius (a spoke of a wheel, a ray, a rod); to be radial is to reach outward from a centre the way a spoke reaches from a hub.
Reaching outward from a centre, arranged like spokes. The geometry is honest about what it needs: a radial shape cannot exist without a heart for every line to begin at.