Etymology

dodecagonal

D2O1D2E1C3A1G2O1N1A1L1

Today it means: Having twelve sides and twelve angles Full definition →

Proto-Indo-European *h₂élisder.? ← English dodecagon
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The story

  1. Englishdodecagon
  2. Proto-Indo-European*h₂el-
  3. Proto-Indo-European*h₂élisder.?
  4. English todaydodecagonal

From dodecagon + -al.

Etymology from Wiktionary, CC BY-SA 4.0.