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Definition of meitnerium noun from the Oxford Advanced Learner's Dictionary

meitnerium

noun
 
/maɪtˈnɪəriəm/
 
/maɪtˈnɪriəm/
[uncountable]
(symbol Mt)
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  1. a radioactive chemical element. Meitnerium is produced when atoms crash into each other.
    Word Origin1990s: modern Latin, from the name of L. Meitner (1878-1968), Austrian-born Swedish physicist.
See meitnerium in the Oxford Advanced American Dictionary
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