unnilennium

American  

[yoo-ni-len-ee-uhm] / ˌyu nɪˈlɛn i əm /

noun

Chemistry, Physics.

1. the systematic element name for element 109 before being named meitnerium. Une

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Etymology

Origin of unnilennium

First recorded in 1980–85; from Latin ūn(us) “one” + nil ( def. ) “zero” + Greek enn(ė́a) “nine” + -ium ( def. )