Etymology

tetrahydro

T1E1T1R1A1H4Y4D2R1O1

Today it means: Four hydrogen atom substituents in a molecule Full definition →

English hydro ← Ancient Greek τετρᾰ- (tetră-) ← Proto-Hellenic *kʷétwores
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The story

  1. Proto-Indo-European*kʷetwóres
  2. Proto-Hellenic*kʷétwores
  3. Ancient Greekτέσσᾰρες (téssăres)
  4. Ancient Greekτετρᾰ- (tetră-)
  5. Englishtetra-
  6. Englishhydro
  7. English todaytetrahydro

From tetra- + hydro.

Etymology from Wiktionary, CC BY-SA 4.0.