单词	barium fluoride
释义	barium fluoride noun : a white, solid, crystalline compound BaF2 that is used as a material in optics (as in lenses) and as a flux (see flux entry 1 sense 6) in some enamels Barium fluoride would resist the cesium, but it was suitable only for the windows, not for the entire vacuum cell containing the cesium. Nick Taylor, Laser, 2000 Word History First Known Use 1868, in the meaning defined above
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