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| Date: | 1500-1600 |
| Language: | Latin |
| Origin: | 'ray, radius' |
Related topics:
1TM the distance from the centre to the edge of a circle, or a line drawn from the centre to the edge [↪ diameter]
2TM an area that covers a particular distance in all directions from a central point : 
The shock of the explosion was felt over a radius of forty miles.
The shock of the explosion was felt over a radius of forty miles. within a 10-mile/200-metre etc radius There are more than a dozen golf courses within a 15-mile radius of St Andrews.
There are more than a dozen golf courses within a 15-mile radius of St Andrews.3 technicalHBH the outer bone of the lower part of your arm
