sequanium

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noun

An early name for the element neptunium, based on a discredited claim of discovery.

OriginLatin Sequana →
Scrabble 20
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Meanings

nounsequanium (uncountable)
  1. obsoleteuncountableAn early name for the element neptunium, based on a discredited claim of discovery.

Origin

  1. LatinSequana“the river Seine”
  2. Englishsequanium

Learned borrowing from Latin Sequana (“the river Seine”) + -ium. Horia Hulubei, who thought he had discovered element 93, worked near the river at that time.

More words from Latin

Full word history & related roots →
Cite this entry
APA

sequanium. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/sequanium

MLA

“sequanium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/sequanium. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “sequanium,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/sequanium.

Source: sequanium on Wiktionary, CC BY-SA 4.0.