Etymology

pentaborane

P3E1N1T1A1B3O1R1A1N1E1

Today it means: Either of two boranes containing five boron atoms, but especially the stable compound B₅H₉ once proposed as a rocket fuel Full definition →

English borane ← Ancient Greek πεντᾰ- (pentă-) ← Proto-Hellenic *pénkʷe
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The story

  1. Proto-Indo-European*pénkʷe
  2. Proto-Hellenic*pénkʷe
  3. Ancient Greekπέντε (pénte)
  4. Ancient Greekπεντᾰ- (pentă-)
  5. Englishpenta-
  6. Englishborane
  7. English todaypentaborane

From penta- + borane.

Etymology from Wiktionary, CC BY-SA 4.0.