radius

Word family

ra·di·us /ˈreɪdiəs/ noun (plural radii /-diaɪ/) [countableC]

1. TMthe distance from the centre to the edge of a circle, or a line drawn from the centre to the edge 〔圆的〕半径（长度） → diameter →5 see picture at 见图 circle1

2 TMan area that covers a particular distance in all directions from a central point 半径范围；周围

The shock of the explosion was felt over a radius of forty miles.

爆炸引起的剧烈震动在方圆40英里内都能感觉得到。

within a 10-mile/200-metre etc radius

There are more than a dozen golf courses within a 15-mile radius of St Andrews.

圣安德鲁斯方圆15英里之内有超过12个高尔夫球场。

3. technicalHBH the outer bone of the lower part of your arm 桡骨 →5 see picture at 见图 skeleton

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”

Chinese

Syllable

Corpus