Etymology

quadrilateral

quad·ri·lat·er·al
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Today it means: A polygon with four sides. Full definition →

New Latin quadrilaterus
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The story

  1. New Latin · learned borrowing fromquadrilaterus
  2. English todayquadrilateral

Learned borrowing from New Latin quadrilaterus + -al.

Etymology from Wiktionary, CC BY-SA 4.0.