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cesium 也作 cae·si·um AHD[sēʹzē-əm] D.J.[ˈsiːziːəm]K.K.[ˈsiziəm]n.Symbol Cs （名词）符号 Cs - A soft, silvery-white ductile metal, liquid at room temperature, the most electropositive and alkaline of the elements, used in photoelectric cells and to catalyze hydrogenation of some organic compounds. Atomic number 55; atomic weight 132.905; melting point 28.5°C; boiling point 690°C; specific gravity 1.87; valence 1. See table at element 铯：一种质地柔软的银白色韧性金属，室温时为液体，为最具正电性与碱性的元素，用作光电池和某些有机化合物氢化作用的催化剂。原子序数55；原子量132.905；熔点28.5°C；沸点°C；比重1.87；化合价1 参见 element
- From Latin caesius [bluish gray (from its blue spectral lines)] 源自 拉丁语 caesius [兰灰色（得名于蓝色光谱线）]
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