Etymology

quatrefoil

quat·re·foil
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Today it means: A symmetrical shape that forms the overall outline of four partially-overlapping circles of the same diameter. Full definition →

Old French quatrefoil
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The story

  1. Old French · derived fromquatrefoil
  2. English todayquatrefoil

From Old French quatrefoil, from quatre (“four”) + foil (“leaf”).

Etymology from Wiktionary, CC BY-SA 4.0.