Quadrilateral
Pronunciation : Quad`ri*lat"er*al
Part of Speech : a.
Etymology : [L. quadrilaterus: cf. F. quadrilat?re, quadrilat?ral. See Quadri- and Lateral.]
Definition : Defn: Having four sides, and consequently four angles; quadrangular.
Source : Webster's Unabridged Dictionary, 1913
Pronunciation : Quad`ri*lat"er*al
Part of Speech : n.
Definition : 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.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder