Etymology

tetragonal

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Today it means: Having four sides, like a tetragon. Full definition →

Proto-Indo-European *h₂élisder.? ← English tetragon ← Ancient Greek τετράγωνος (tetrágōnos)
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The story

  1. Proto-Indo-European*kʷetwóres
  2. Proto-Hellenic*kʷétwores
  3. Ancient Greekτέσσᾰρες (téssăres)
  4. Ancient Greekτετρα- (tetra-)
  5. Proto-Indo-European*ǵónu
  6. Proto-Hellenic*gónu
  7. Proto-Hellenic*gonwía
  8. Ancient Greekγωνίᾱ (gōníā)
  9. Ancient Greekτετράγωνος (tetrágōnos)
  10. Englishtetragon
  11. Proto-Indo-European*h₂el-
  12. Proto-Indo-European*h₂élisder.?
  13. English todaytetragonal

From tetragon + -al.

Etymology from Wiktionary, CC BY-SA 4.0.