1. a quadrilateral with one pair of parallel sides
Usage: British English; called trapezoid in American English
2. a quadrilateral with no parallel sides
Usage: American English; called trapezoid in British English
3. a small bone in the wrist near the base of the thumb
Usage: anatomy

Examples

• The architect designed a window in the shape of a trapezium.
• In geometry class, we learned to calculate the area of a trapezium.
• The trapezium bone connects to the thumb’s metacarpal.
• She drew a trapezium with parallel top and bottom sides.
• The irregular trapezium had no parallel sides at all.
• A fracture of the trapezium can affect thumb movement.