词根：radi-, -ray-, -rad-, -radio- = ray, beam 光线, 辐射

  来源拉丁语 radix /radius/radiare 光 / 辐射，-ray-,-rad-,-radio- 为 -radi- 的变体。它相应的希腊语词根为： -acti(n)-,-actino- 光,光线,呈放射状的,放射线的。

  （*拉丁文radius (= ray)。——英文字根字典）


同源词：

1. radiant （闪耀的rad(=ray)，-i- 连接符（又称为中缀），-ant形容词字尾）
  adj. 容光焕发的；辐射的
  radiate v.放射；散发
  radiation n.放射，散发；放射物
  radiator n.散热器；电炉
  radium n.镭 （-um = 拉丁字尾）
  radioactive adj.放射性的
  You had the most radiant smile as you crossed the finish line.你超过终点线进绽放出了最灿烂的笑容。

2. radar n.雷达，无线电探测器（来源于radio detecting and ranging）
  radar fence /screen 雷达网
  radar homing 雷达导航的
  radar installation 雷达装置
  follow the flight of an aircraft by radar 通过雷达追踪飞机

3. radial adj.光线；半径的；（自行车轮辐条等）放射状的 （能够发射光线的）
  radial tire 子午线轮胎

4. radius n.（圆、球的）半径；半径范围；（活动等的）范围（由中心所发的光能到达的范围）
  every tree within a radius of two miles 周围2英里的所有树木
  radius of action 行动范围

5. radiance;-ancy n.闪烁；发光

6. radio n.无线电报；无线电话；无线电广播；收音机

7. radioactive adj.有辐射能的；放射性的（主动辐射的）《active = 主动的》

8. radioactivity n.放射性；放射现象

9. radiology n.放射学；应用辐射学；放射线科《logy = stydy》

10. radiotelephone n.无线电话（机）《telephone = 电话机》

12. radiotherapy n.X光治疗法；放射线治疗法《therapy = 治疗法》

13. irradiate v.照耀；发出；照射（将光线投射在...上）《ir- = in- = on》

14. irradiation n.发光；光线；照射

15. irradiant adj.发光的；灿烂的

16. irradiance n.发光；光辉；灿烂

词根词缀：electro-, electr-, electri-

【来源及含义】Greek > Latin: electric, electricity; from amber, resembling amber, generated from amber which when rubbed vigorously [as by friction], produced the effect of static electricity

【相关描述】Equipment which we use everyday relies on electronics to function including calculators, car controls, cameras, washing machines, medical scanners, mobile telephones, radar systems, computers; as well as many other applications or devices which are listed in this unit.

【相关词根词缀】 A cross reference of word units that are related, directly and/or indirectly, with "electricity": galvano-; hodo-; ion-; piezo-; -tron; volt; biomechatronics, info; mechatronics, info.

【同源单词】acoustoelectric effect, acoustoelectronics, active electrode, ambulatory electrocardiographic monitoring, amphoteric electrolyte, anelectrotonus