TRAPEZOID

trapezoid. Trapezoid, n. a figure having two parallel sides, or an irregular figure having 4 sides not parallel

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Trap″e‐zoid (?), n. [[Gr. � trapezoid-shaped; � table + � shape, likeness: cf. F. trapézoïde. See Trapezium.]] 1. 1. (Geom.) A plane four-sided figure, having two sides parallel to each other.
2. 2. (Anat.) A bone of the carpus at the base of the second metacarpal, or index finger.