Radius - Definition
radius
n 1: the length of a line segment between the center and
circumference of a circle or sphere [syn: radius, r]
2: a straight line from the center to the perimeter of a circle
(or from the center 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 [syn: spoke, wheel spoke, radius]