Etymology

diprotium

D2I1P3R1O1T1I1U1M3

Today it means: Normal molecular hydrogen H₂ Full definition →

English protium ← Latin di- ← Ancient Greek δῐ- (dĭ-)
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The story

  1. Proto-Indo-European*dwóh₁
  2. Proto-Indo-European*dwi-
  3. Proto-Hellenic*dwi-
  4. Ancient Greekδῐ- (dĭ-)
  5. Latindi-
  6. Englishdi-
  7. Englishprotium
  8. English todaydiprotium

From di- + protium.

Etymology from Wiktionary, CC BY-SA 4.0.