radii Meaning, Definition & Usage

1. noun the length of a line segment between the center and circumference of a circle or sphere
   r; radius.
   
2. noun a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)
   radius.
   
3. noun a circular region whose area is indicated by the length of its radius
   radius.
   
   • they located it within a radius of 2 miles
4. noun the outer and slightly shorter of the two bones of the human forearm
   radius.
   
5. noun support consisting of a radial member of a wheel joining the hub to the rim
   wheel spoke; radius; spoke.
   

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