- trapezium - a quadrilateral with no parallel sides
--1 is a kind of quadrilateral, quadrangle, tetragon
Antonyms: parallelogram
- Trapezium, the Trapezium - a multiple star in the constellation of Orion
--2 is a kind of multiple star
- trapezium, trapezium bone, os trapezium - the wrist bone on the thumb side of the hand that articulates with the 1st and 2nd metacarpals
--3 is a kind of carpal bone, carpal, wrist bone