trapezoidal adjective. [trapɪ'zɔɪd(ǝ)l] L18.
[from TRAPEZOID + -AL¹.]
1. Geometry. Of a plane figure: having the form of a trapezoid or (esp. N. Amer.) of a trapezium. L18.
trapezoidal rule Math. a method for the approximate numerical integration of the area under a curve, which is treated as a number of trapezia.

2. Of a solid: having trapezoidal faces; trapezohedral. L18.

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