Etymology

sequanium

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Today it means: An early name for the element neptunium, based on a discredited claim of discovery. Full definition →

Latin Sequana
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The story

  1. Latin · learned borrowing fromSequana“the river Seine”
  2. English todaysequanium

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.

Etymology from Wiktionary, CC BY-SA 4.0.