Etymology

actinoid

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Today it means: actinide Full definition →

Ancient Greek εἶδος (eîdos) ← Proto-Hellenic *wéidos ← Proto-Indo-European *wéydos
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The story

  1. Ancient Greekᾰ̓κτῑ́ς (ăktī́s)
  2. Englishactino-
  3. Englishactin-
  4. Proto-Indo-European*weyd-
  5. Proto-Indo-European*wéydos
  6. Proto-Hellenic*wéidos
  7. Ancient Greekεἶδος (eîdos)
  8. English todayactinoid

From actin- + -oid.

Etymology from Wiktionary, CC BY-SA 4.0.