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ytterbium

noun
/ɪˈtɜːbiəm/
/ɪˈtɜːrbiəm/
[uncountable]
(symbol Yb)
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  1. a chemical element. Ytterbium is a silver-white metal used to make steel stronger and in some X-ray machines.
    Word Originlate 19th cent.: modern Latin, from Ytterby, the name of a Swedish quarry where it was first found.

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