trapezium

• 名词，有两个主要含义：在几何学中指没有平行边的四边形；在解剖学中指腕部拇指侧的腕骨，与第一和第二掌骨相连。

A noun with two distinct meanings: in geometry, it refers to a quadrilateral with no parallel sides; in anatomy, it refers to a wrist bone on the thumb side that articulates with the first and second metacarpals.

1. Quadrilateral shapeB2formalbritish

   A four-sided geometric figure with no parallel sides.

   不规则四边形

   • The children learned to draw a trapezium in geometry class.
   • A trapezium has four sides, but none of them are parallel.
   • The shape of the field was an irregular trapezium.

   同义词trapezoid

2. Wrist boneC1formalmedical

   A small bone in the wrist, located on the thumb side, that connects with the first and second metacarpal bones.

   大多角骨

   • The trapezium bone is essential for thumb movement.
   • A fracture of the trapezium can cause difficulty gripping objects.
   • The surgeon examined the trapezium for signs of arthritis.