TRAPEZOID Meaning of TRAPEZOID in English n. 1 Brit. a quadrilateral with no two sides parallel. 2 US = TRAPEZIUM 1. trapezoidal adj.[ mod.L trapezoides f. Gk trapezoeides (as TRAPEZIUM) ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012