trapezium (redirected from os trapezium)

trapezium /tra·pe·zi·um/ (-um) [L.]

1. an irregular, four-sided figure.

2. the most lateral bone of the distal row of carpal bones.

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tra·pe·zi·um (tr-pz-m)

n. pl. tra·pe·zi·ums or tra·pe·zi·a (-z-)

1. A quadrilateral having no parallel sides.

2. A bone in the wrist at the base of the thumb, articulating with the first and second metacarpal, scaphoid, and trapezoid bones.

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trapezium

an irregular, four-sided figure.