unnilpentium

American  

[yoo-nil-pen-tee-uhm] / ˌyu nɪlˈpɛn ti əm /

noun

Chemistry, Physics.

1. the systematic element name for element 105 before being named dubnium. Unp

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Etymology

Origin of unnilpentium

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