quadrilateral
/ˌkwɒd.ɹəˈlæt.əɹ.əl/
noun
- 1
A polygon with four sides.
- 2
An area defended by four fortresses supporting each other.
“The Venetian quadrilateral comprised Mantua, Peschiera, Verona, and Legnano.”
adjective
- 1
Having four sides.
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