Etymology

megatonne

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English tonne ← Ancient Greek μέγᾰς (mégăs) ← Proto-Hellenic *mégas
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The story

  1. Proto-Indo-European*méǵh₂s
  2. Proto-Hellenic*mégas
  3. Ancient Greekμέγᾰς (mégăs)
  4. Englishmega-
  5. Englishtonne
  6. English todaymegatonne

From mega- + tonne.

Etymology from Wiktionary, CC BY-SA 4.0.