trapezium
/trəˈpiziəm/
noun
- A flat shape with four sides, where only two sides are parallel to each other.
- She calculated the area of the trapezium by averaging the lengths of the two parallel sides.
- A trapezium is different from a parallelogram because it has only one pair of parallel sides.
- The math teacher drew a trapezium on the board and labeled its parallel sides.
- A small bone in the wrist, near the base of the thumb.
- The trapezium articulates with the first metacarpal bone to form the thumb joint.
- The trapezium is one of the eight carpal bones in the human wrist.
- He fractured his trapezium when he fell on his outstretched hand.