The story
- Proto-Indo-European*kʷetwóres
- Proto-Hellenic*kʷétwores
- Ancient Greekτέσσᾰρες (téssăres)
- Ancient Greekτετρᾰ- (tetră-)
- Englishtetra-
- Englishballoon
- English todaytetroon
Etymology from Wiktionary, CC BY-SA 4.0.
tetroon
Today it means: A constant-level weather balloon in the shape of a tetrahedron used to make observations in the lower atmosphere. Full definition →
English balloon ← Ancient Greek τετρᾰ- (tetră-) ← Proto-Hellenic *kʷétwores