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  1. [noun] the length of a line segment between the center and circumference of a circle or sphere

  2. [noun] a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)

  3. [noun] a circular region whose area is indicated by the length of its radius; "they located it within a radius of 2 miles"

  4. [noun] the outer and slightly shorter of the two bones of the human forearm

  5. [noun] support consisting of a radial member of a wheel joining the hub to the rim
    Synonyms: spoke


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