Etymology

Mesoproterozoic

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Today it means: Of a geologic era within the Proterozoic eon; comprises the Calymmian, Ectasian and Stennian periods from about 1600 to 900 million years ago, when the Rodinia supercontinent was formed. Full definition →

English Proterozoic ← Ancient Greek μέσος (mésos) ← Proto-Hellenic *métsos
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The story

  1. Proto-Indo-European*me
  2. Proto-Indo-European*dʰeh₁-?
  3. Proto-Indo-European*médʰi
  4. Proto-Indo-European*médʰyos
  5. Proto-Hellenic*métsos
  6. Ancient Greekμέσος (mésos)
  7. Englishmeso-
  8. EnglishProterozoic
  9. English todayMesoproterozoic

From meso- + Proterozoic.

Etymology from Wiktionary, CC BY-SA 4.0.