• n. 半徑，半徑范圍；[解剖] 橈骨；輻射光線；有效航程
• n. (Radius)人名；(意、印尼)拉迪烏斯；(英)雷迪厄斯；(法)拉迪于斯

rad-,半徑，根，-us,陽性格。

radius (n.)

1590s, "cross-shaft," from Latin radius "staff, stake, rod; spoke of a wheel; ray of light, beam of light; radius of a circle," of unknown origin. Perhaps related to radix "root," but Tucker suggests connection to Sanskrit vardhate "rises, makes grow," via root *neredh- "rise, out, extend forth;" or else Greek ardis "sharp point."

The geometric sense first recorded 1610s. Plural is radii. Meaning "circular area of defined distance around some place" is attested from 1953. Meaning "shorter bone of the forearm" is from 1610s in English (the Latin word had been used thus by the Romans).

1. Nigel has searched for work in a ten-mile radius around his home.

奈杰爾一直在他家周圍10英里的范圍內找工作。

來自柯林斯例句

2. They deliver to within a 5-mile radius of the store.

他們在距離商場5英里的范圍內送貨上門。

來自《權威詞典》

3. He has visited every shop within a radius of two miles.

周圍兩英里以內的店鋪他都去過.

來自《簡明英漢詞典》

4. We are measuring the radius of the circle.

我們正在測量圓的半徑.

來自《簡明英漢詞典》

5. A special load balancing server designed for solving this problem can manage multi RADIUS servers.

設計了一個專門的負載平衡服務器,調度多個RADIUS服務器,使得各個服務器的負載達到均衡.

來自互聯網