radon
英 ['re?d?n]
美['redɑn]
- n. [化學(xué)] 氡（元素符號(hào)Rn）
- n. (Radon)人名；(法、塞)拉東
英英釋意
- 1. a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health