Etymology

radioactinium

R1A1D2I1O1A1C3T1I1N1I1U1M3

Today it means: The radioactive isotope of actinium, 22789Ac, having a half-life of 21.7 years Full definition →

English actinium ← French actinium ← Ancient Greek ᾰ̓κτῑ́ς (ăktī́s)
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The story

  1. Englishradio-
  2. Ancient Greekᾰ̓κτῑ́ς (ăktī́s)
  3. Frenchactino-
  4. Frenchactinium
  5. Englishactinium
  6. English todayradioactinium

From radio- + actinium.

Etymology from Wiktionary, CC BY-SA 4.0.