Etymology

actinium

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Today it means: A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores. Full definition →

French actinium ← Ancient Greek ᾰ̓κτῑ́ς (ăktī́s)
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The story

  1. Ancient Greekᾰ̓κτῑ́ς (ăktī́s)
  2. Frenchactino-
  3. Frenchactinium
  4. English todayactinium

Borrowed from French actinium. actin- + -ium.

Etymology from Wiktionary, CC BY-SA 4.0.