radius

noun

1. 1

   support consisting of a radial member of a wheel joining the hub to the rim

2. 2

   the length of a line segment between the center and circumference of a circle or sphere

3. 3

   the outer and slightly shorter of the two bones of the human forearm

4. 4

   a circular region whose area is indicated by the length of its radius

   they located it within a radius of 2 miles

5. 5

   a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)