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ONAD→quadrilateral

quadrilateral

Flag: gbEnglishOxford New American Dictionary
quadrilateral /ˌkwädrəˈladərəl, , ˌkwɑdrəˈlædərəl , ˌkwädrəˈlatrəl, ˌkwɑdrəˈlætrəl /
▸ noun a four-sided figure.
▸ adjective having four straight sides.
– ORIGIN mid 17th century : from late Latin quadrilaterus (from Latin quadri- ‘four’ + latus, later- ‘side’) + -al.