1 the distance from the centre of a circle to the outside edge 半径 ☞Look at diameter and circumference. 参看diameter及circumference。 ☞picture at circle 见circle插图

2 a circular area that is measured from a point in its centre 半径范围: The wreckage of the plane was scattered over a radius of several miles. 飞机的残骸散落在方圆数英里的地方。

3 (medical医学) the shorter bone of the two bones in the lower part of your arm between your wrist and your elbow 桡骨 ☞Look at ulna. 参看ulna。 ☞picture at body 见body插图