Illinium

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
A rejected name for promethium. obsolete, uncountable

Synonyms

Etymology

From Illinois + -ium, from the University of Illinois at Urbana-Champaign, which made an unverifiable claim to have discovered the element in 1926.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.