beta
/ˈbiːtə/noun
1- the second letter of the Greek alphabet (B, β), transliterated as 'b'希腊字母表中第二个字母（译写为b）。
1.1
- as modifier denoting the second of a series of items, categories, forms of a chemical compound, etc.乙, β项, β类（一系列项目、分类中的第二位或化合物的第二种形式）。
1.2
- Brit. a second-class mark given for an essay, examination paper, or other piece of work〈英〉（论文、考试成绩等的）β等, 乙等。
1.4
Beta
followed by Latin genitive Astronomy the second (typically second-brightest) star in a constellation【天文】β星（星座中第二颗星, 亮度多居第二位）：Beta Virginis.
室女座β星。
1.5
- as modifier relating to beta decay or beta particles.β衰变的, β粒子的：
beta emitters.
β发射体。
1.6
- （亦作beta coefficient）a measure of the movement in price of a security relative to the stock market as a whole, used to indicate possible risk.β系数, β因素（与整体股市相对而言的证券价格变动,用以预测风险）。
词源
via Latin from Greek.