trapezium

trapezium definition - medical

tra·pe·zi·um (trə-pēˈzē-əm)

noun pl. tra·pe·zi·ums or tra·pe·zi·a (-zē-ə)
  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.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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