Definition of 'radius'

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1. (noun) radius, r the length of a line segment between the center and circumference of a circle or sphere 2. (noun) radius a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere) 3. (noun) radius a circular region whose area is indicated by the length of its radius "they located it within a radius of 2 miles" 4. (noun) radius the outer and slightly shorter of the two bones of the human forearm 5. (noun) spoke, wheel spoke, radius support consisting of a radial member of a wheel joining the hub to the rim
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"radius." Definitions.net. STANDS4 LLC, 2008. 7 October. 2008. http://www.definitions.net/definition/radius