quadrilateral
UK /ˌkwɒdɹɪˈlætəɹəl/ · US /ˌkwɑdɹəˈlætəɹəl/ noun, adjective
Forms quadrilaterals
- noun (geometry) A polygon with four sides.
- noun An area defended by four fortresses supporting each other. “The Venetian quadrilateral comprised Mantua, Peschiera, Verona, and Legnano.”
- adjective Having four sides. “They spoke at a quadrilateral meeting of the trade ministers of the United States, the European Union, Canada, and Japan.”
Synonyms
Etymology
Learned borrowing from New Latin quadrilaterus + -al.
Webster’s 1913
- adjective Having four sides, and consequently four angles; quadrangular.
- noun A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines.
- noun 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.
Etymology [L. quadrilaterus: cf. F. quadrilatère, quadrilatéral. See Quadri- and Lateral.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “quadrilateral”, CC BY-SA 4.0. Details