New Latin, from unnil- + Greek pente five + New Latin -ium — more at five
1979, in the meaning defined above
unnilhexium
unnilpentium
unnilquadium
“Unnilpentium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unnilpentium. Accessed 16 Oct. 2024.
Britannica.com: Encyclopedia article about unnilpentium
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