/ ˈtɜːbiəm; NAmE ˈtɜːrb-/ noun
[ U ] ( symb Tb ) a chemical element. Terbium is a silver-white metal used in lasers , X-rays and television tubes .
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WORD ORIGIN
mid 19th cent.: modern Latin , from Ytterby , the name of a village in Sweden where it was discovered. Compare with erbium and ytterbium .