quadrilateral
noun /ˌkwɒdrɪˈlætərəl/
/ˌkwɑːdrɪˈlætərəl/
(geometry)- a flat shape with four straight sidesTopics Colours and Shapesc2Word Originmid 17th cent.: from late Latin quadrilaterus (from Latin quadri- ‘four’ + latus, later- ‘side’) + -al.