From Longman Dictionary of Contemporary Englishradiusra‧di‧us /ˈreɪdiəs/ ●○○ noun (plural radii /-diaɪ/) [countable] 1 TMthe distance from the centre to the edge of a circle, or a line drawn from the centre to the edge → diameter2 TMan 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.within a 10-mile/200-metre etc radius 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
Examples from the Corpus
radius• The moon has a radius of approximately 1737 kilometers.• The ionic radius varies among the elements depending on atomic number and ionic charge of the ion.• The group also looked for John Deere equipment in a 20-mile radius.• All life, plant and animal, within a mile radius of Ground Zero simply vanished.• There were still a few funeral directors within a thirty-mile radius I had not, as yet, contacted.• The equatorial and polar radii have been measured by various means and correspond to some level above the cloud tops.• This is about a factor of 3 smaller than current best estimates of the neutron star radius.• There is a single tendon insertion into the radius bone of the forearm.within a 10-mile/200-metre etc radius• Within a 10-mile radius there are several archaeological sights, stone circles and museums to visit.Origin radius (1500-1600) Latin “ray, radius” 