quadrilaterals

/K W AA0 D R IH0 L AE1 T ER0 AH0 L Z/
noun
  1. 1

    A polygon with four sides.

  2. 2

    An area defended by four fortresses supporting each other.

    โ€œThe Venetian quadrilateral comprised Mantua, Peschiera, Verona, and Legnano.โ€

Source: https://en.wiktionary.org/wiki/quadrilateral, https://en.wiktionary.org/wiki/quadrilaterals