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trapezium

noun [C]
 
 
/trəˈpiː.zi.əm/ (plural trapezia /trəˈpiː.zi.ə/ or trapeziums) UK specialized (US trapezoid)

Definition

a flat shape with four sides, where two of the sides are parallelGeometrical shapesSpherical, circular and annular objects
(Definition of trapezium noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of trapezium