Oxford Advanced American Dictionary

Definition of trapezoid noun from the Oxford Advanced Learner's Dictionary

trapezoid

noun
trapezoid pronunciation English ˈtræpəzɔɪd trapezoid pronunciation American ˈtræpəzɔɪd
(geometry)
 
1 (British English) (North American English trapezium) a flat shape with four straight sides, none of which are parallel2 (North American English) (British English trapezium) a flat shape with four straight sides, one pair of opposite sides being parallel and the other pair not parallel