• noun:   the length of a line segment between the center and circumference of a circle or sphere
• noun:   the outer and slightly shorter of the two bones of the human forearm
• noun:   a circular region whose area is indicated by the length of its radius

  Example: "They located it within a radius of 2 miles"

• noun:   a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)
• noun:   support consisting of a radial member of a wheel joining the hub to the rim

Related words...