quadrilateral

A polygon having four sides.

Having four sides.

Having four sides; composed of four lines.

A figure formed of four Straight lines.

Milit., the space inclosed between, and defended by, four fortresses: as, the Bulgarian quadrilateral. The most famous quadrilateral was that in northern Italy, inclosed by the fortresses of Peschiera, Mantua, Verona, and Legnago.

Having four sides, and consequently four angles; quadrangular.

A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines.

An area defended by four fortresses supporting each other.

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.

a polygon having four sides.