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  • noun
    /ˈreɪdijəs/ , pl radii /ˈreɪdiˌaɪ/
    [count] technical :a straight line from the center of a circle or sphere to any point on the outer edge
    Measure the radius of the circlealso;  :the length of this line
    a radius of 10 inches
    an area that goes outward in all directions from a particular place
    The new museum is expected to draw people from a wide radius.
    More than 100,000 students live within a 10-mile radius of the university. [=within 10 miles of the university]
    medical :the bone in the lower part of your arm on the same side as your thumb - see picture at geometry