Defn: Having four sides, and consequently four angles; quadrangular.
QUADRILATERAL
Quad`ri*lat"er*al, n.
1. (Geom.)
Defn: A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines.
2. An area defended by four fortresses supporting each other; as, the Venetian quadrilateral, comprising Mantua, Peschiera, Verona, and Legnano. 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.
QUADRILATERALNESS
Quad`ri*lat"er*al*ness, n.
Defn: The property of being quadrilateral.
QUADRILITERAL
Quad`ri*lit"er*al, a. Etym: [Quadri- + literal.]
Defn: Consisting of four letters.
QUADRILLE Qua*drille", n. Etym: [F. quadrille, n. fem., fr. Sp. cuadrilla meeting of four or more persons or It. quadriglia a band of soldiers, a sort of dance; dim. fr. L. quadra a square, fr. quattuor four. See Quadrate.]