01 a. Having four sides, and consequently four angles; quadrangular.
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1.
Having four sides, and consequently four angles; quadrangular.
Entry
3 senses · 2 variants
Webster, 1913
Quadrilateral
02 n. A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines.
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1.
A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines.(Geom.)
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2.
An area defended by four fortresses supporting each other; as, the Venetian quadrilateral, comprising Mantua, Peschiera, Verona, and Legnano.
Phrases & compounds
Complete quadrilateral —
the figure made up of the six straight lines that can be drawn through four points, A, B, C, I, the lines being supposed to be produced indefinitely.