trapezium /trəˈpiːzijəm/ noun plural trapeziums or trapezia /-zijə/ /trəˈpiːzijə/ plural trapeziums or trapezia /-zijə/ /trəˈpiːzijə/ Learner's definition of TRAPEZIUM
[count] geometry
1
US : a four-sided shape that has no parallel sides不规则四边形 — called also (British) trapezoid