quadrilateral
Noun · AdjectiveOpen English WordNet
Noun (1)
- a four-sided polygonSynonyms: quadrangletetragonType of polygon, polygonal shapeKinds trapezium, trapezoid, parallelogram
Adjective (1)
- having four sidesSynonyms: four-sidedOpposite one-sidedSimilar multilateral, many-sided
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Webster's Dictionary (1913)
Quad′ri·lat′er·al adjective
Origin: L. quadrilaterus: cf. F. quadrilatère, quadrilatéral. See Quadri- and Lateral.
Having four sides, and consequently four angles; quadrangular.
Quad′ri·lat′er·al noun
1. Geometry 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 Geometry, 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.
Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54