trapezoid

trapezoid /trap·e·zoid/ (trap´e-zoid)

1. having the shape of a four-sided plane, with two sides parallel and two diverging.

2. the bone in the distal row of carpal bones lying between the trapezium and capitate bones.

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trap·e·zoid (trp-zoid)

n.

1. A quadrilateral having two parallel sides.

2. A small bone in the wrist that is situated near the base of the index finger and that articulates with the second metacarpal, trapezium, capitate, and scaphoid bones.

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trape·zoid, trape·zoidal (-zoidl) adj.