Etymology

polygonal

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Today it means: Having many angles; hence characteristic of a polygon. Full definition →

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

  1. Englishpolygon
  2. Proto-Indo-European*h₂el-
  3. Proto-Indo-European*h₂élisder.?
  4. English todaypolygonal

From polygon + -al.

Etymology from Wiktionary, CC BY-SA 4.0.