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

Derived forms: radiuses, radii

Type of: arm bone, length, part, region, straight line, support

Part of: bicycle wheel, cartwheel, diam, diameter, forearm, wagon wheel

Encyclopedia: Radius