Meanings
nounillinium (uncountable)
- obsoleteuncountableA rejected name for promethium.
Synonyms & antonyms
Also see
Origin
From Illinois + -ium, from the University of Illinois at Urbana-Champaign, which made an unverifiable claim to have discovered the element in 1926.
Full word history & related roots →Cite this entry
APA
illinium. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/illinium
MLA
“illinium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/illinium. Accessed November 2, 2026.
Chicago
WatkinsX Dictionary, s.v. “illinium,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/illinium.
Source: illinium on Wiktionary, CC BY-SA 4.0.