radium
radium
[ˈreɪdɪəm]
noun
[ˈreɪdɪəm]
noun
- [mass noun]the chemical element of atomic number 88, a rare radioactive metal of the alkaline earth series. It was formerly used as a source of radiation for radiotherapy(Symbol: Ra)
（化学元素）镭(符号：Ra) - Radium is the most reactive member of the alkaline earth metals. It is rare in nature, occurring chiefly as an impurity in uranium ores. Radium was formerly used extensively in the treatment of tumours and in luminous materials, but it has now been largely replaced by other substances for these purposes
- late 19th cent.: from Latin radius 'ray' + -ium
热门查询
- conductible adj.可传导的
- conductimetric abbr.conductance+metric 电导的
- conduction n.（热、电等的）传导，导热，导电,传导率,传导性,电导
- conductive adj.传导的
- conductivity n.传导性，传导率，电导率
- conductometer n.热导计电导计
- conductor n.<电>导体,售票员,（乐队）指挥,导管（套管的一种）
- conductress n.女向导，女性乐队长，女车长
- conduit n.[电]导管,水道，沟渠
- conduplicate adj.双折的，折合状的
- condy n.过锰酸钾液（商品名）
- condylar adj.髁的
考试词汇表
