Etymology

nonagonal

N1O1N1A1G2O1N1A1L1

Today it means: Having nine sides and nine angles. Full definition →

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

  1. Englishnonagon
  2. Proto-Indo-European*h₂el-
  3. Proto-Indo-European*h₂élisder.?
  4. English todaynonagonal

From nonagon + -al.

Etymology from Wiktionary, CC BY-SA 4.0.