ETYM Greek, trapezoid-shaped; trapes table + eidos shape, likeness: cf. French trapézoďde. Related to Trapezium.
(in US) A quadrilateral with two parallel sides.
In geometry, a four-sided plane figure (quadrilateral) with only two sides parallel. If the parallel sides have lengths a and b and the perpendicular distance between them is h (the height of the trapezoid), its area A=˝h(a + b).
An isosceles trapezoid has its sloping sides (legs) equal, is symmetrical about a line drawn through the midpoints of its parallel sides, and has equal base angles.

1. Having the form of a trapezoid; trapezoidal.
2. Of or pertaining to the trapezoid ligament

The wrist bone between the trapezium and the capitate bones; SYN. trapezoid bone, os trapezoideum.