1. [N. Amer] A quadrilateral with no parallel sides
   "The irregular shape of the field formed a trapezium";
   - trapezoid [Brit]
    
2. [Brit] A quadrilateral with two parallel sides
   "The roof of the gazebo had a trapezium shape";
   - trapezoid [N. Amer]
    
3. The wrist bone on the thumb side of the hand that articulates with the 1st and 2nd metacarpals
   "The trapezium bone is crucial for thumb movement"; "The os trapezium bone is crucial for thumb movement";
   - trapezium bone, os trapezium

1. A multiple star system located in the Orion Nebula
   "The Trapezium's four brightest stars form a distinctive pattern"

Derived forms: trapeziums, trapezia

Type of: carpal, carpal bone, multiple star, quadrangle, quadrilateral, tetragon, wrist bone

Antonym: parallelogram

Encyclopedia: Trapezium