Etymology

rectangular

rec·tan·gu·lar
R1E1C3T1A1N1G2U1L1A1R1

Today it means: Having a shape like a rectangle. Full definition →

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

  1. Englishrectangle
  2. Proto-Indo-European*h₂el-
  3. Proto-Indo-European*h₂élisder.?
  4. English todayrectangular

From rectangle + -ar.

Etymology from Wiktionary, CC BY-SA 4.0.