Etymograph

English

tetrahydro

Tetrahydro comes from Ancient Greek τέσσᾰρες ‘four’, and goes back to Proto-Indo-European *kʷetwóres.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*kʷetwóres1‘four’reconstructed
  2. Proto-Hellenicc. 2200–1600 BCE*kʷétwores1‘four’reconstructed
  3. Ancient Greekc. 800–300 BCEτέσσᾰρες1téssăres‘four’
  4. English1500–presenthydro1
  5. Englishtodaytetrahydro1

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, English tetrahydro

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*kʷetwóresWiktionary, English tetrahydro‘four’reconstructed
  2. Proto-Hellenicc. 2200–1600 BCE*kʷétworesWiktionary, English tetrahydro‘four’reconstructed
  3. Ancient Greekc. 800–300 BCEτέσσᾰρεςWiktionary, English tetrahydrotéssăres‘four’
  4. English1500–presenthydroWiktionary, English tetrahydro
  5. EnglishtodaytetrahydroWiktionary, English tetrahydro

Linked words

through Proto-Indo-European *kʷetwóres ‘four’

fourth, quarry, cater, kern, farthing, carillon, quatre, quire, ferd, cuatro, quatrain, 18 more

Today it means

noun Four hydrogen atom substituents in a molecule

Sources

Sources: Wiktionary, “tetrahydro”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.

Etymograph / Proto-Indo-European *kʷetwóres / tetrahydro

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