m]
. | 1. | Geometry.
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| 2. | Anatomy. a bone in the wrist that articulates with the metacarpal bone of the thumb. |
trapezium tra·pe·zi·um (trə-pē'zē-əm)
n. pl. tra·pe·zi·ums or tra·pe·zi·a (-zē-ə)
A quadrilateral having no parallel sides.
A bone in the wrist at the base of the thumb, articulating with the first and second metacarpal, scaphoid, and trapezoid bones.
| trapezium (trə-pē'zē-əm) Pronunciation Key
Plural trapeziums or trapezia A four-sided plane figure having no parallel sides. |