tennessine

noun
ten·nes·sine | \ ˈte-nə-ˌsēn \

Definition of tennessine 

: a short-lived artificially produced radioactive element that has 117 protons symbol Ts

First Known Use of tennessine

2016, in the meaning defined above

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The first known use of tennessine was in 2016

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occurring twice a year or every two years

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