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radius

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radius/ˈreɪdijəs/noun
pluralradii/ˈreɪdiˌaɪ/
radius
/ˈreɪdijəs/
noun
pluralradii/ˈreɪdiˌaɪ/
Learner's definition of RADIUS  
[count]
technical : a straight line from the center of a circle or sphere to any point on the outer edge
also : the length of this line
— see picture at geometrycompare diameter
: an area that goes outward in all directions from a particular place
medical : the bone in the lower part of your arm on the same side as your thumb
— see picture at human
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