Etymology

tetrahydrate

T1E1T1R1A1H4Y4D2R1A1T1E1

Today it means: A hydrate whose solid contains four molecules of water of crystallization per molecule, or per formula unit Full definition →

English hydrate ← French hydrate ← Ancient Greek τετρᾰ- (tetră-)
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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. Frenchhydrate
  7. Englishhydrate
  8. English todaytetrahydrate

From tetra- + hydrate.

Etymology from Wiktionary, CC BY-SA 4.0.