Complete quadrilateral
Quadrilateral Quad`ri*lat"er*al, n. 1. (Geom.) A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines. [1913 Webster]

2. An area defended by four fortresses supporting each other; as, the Venetian quadrilateral, comprising Mantua, Peschiera, Verona, and Legnano. [1913 Webster]

{Complete quadrilateral} (Geom.), 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. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Quadrilateral — Quad ri*lat er*al, n. 1. (Geom.) A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines. [1913 Webster] 2. An area defended by four fortresses supporting each other; as, the Venetian …   The Collaborative International Dictionary of English

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