Толковый словарь английского языка - yttrium
Yttrium
yttrium
noun Etymology: New Latin, from yttria ~ oxide (Y2O3), irregular from Ytterby, town in southern Sweden Date: 1814 a metallic element usually included in the rare-earth group that occurs usually with other rare earth elements in minerals and is used especially in phosphors, YAG lasers, and superalloys
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n. Chem. a greyish metallic element resembling the lanthanides, occurring naturally in uranium ores and used in making superconductors. Usage Symb.: Y. Etymology: formed as YTTERBIUM ...Толковый словарь английского языка Oxford English Reference
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