1. (noun) radius, r
the length of a line segment between the center and circumference of a circle or sphere
Synonyms: r, radius, gas constant, universal gas constant, roentgen, spoke, wheel spoke
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)
Synonyms: r, spoke, wheel spoke
3. (noun) radius
a circular region whose area is indicated by the length of its radius
Synonyms: r, spoke, wheel spoke
4. (noun) radius
the outer and slightly shorter of the two bones of the human forearm
Synonyms: r, spoke, wheel spoke
5. (noun) spoke, wheel spoke, radius
support consisting of a radial member of a wheel joining the hub to the rim
Synonyms: radius, rundle, r, rung, spoke, wheel spoke
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Synonyms for radius 
