Etymology

octagonal

O1C3T1A1G2O1N1A1L1

Today it means: Shaped like an octagon, in having eight sides and eight angles. Full definition →

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

  1. Englishoctagon
  2. Proto-Indo-European*h₂el-
  3. Proto-Indo-European*h₂élisder.?
  4. English todayoctagonal

From octagon + -al.

Etymology from Wiktionary, CC BY-SA 4.0.