quadrangle
/ˈkwɒdræŋgl/noun
1- Geometry a foursided plane figure, especially a square or rectangle【几何】四角形, 四边形。
1.1
- a square or rectangular space or courtyard enclosed by buildings（由建筑物环绕的）四方场地, 四方院。
词源
late Middle English: from Old French， or from late Latin quadrangulum 'square'， neuter of quadrangulus, from Latin 'four'+angulus 'corner， angle'.