trapezium: Meaning and Definition of

tra•pe•zi•um

1. (in Euclidean geometry) any rectilinear quadrilateral plane figure not a parallelogram.
2. a quadrilateral plane figure of which no two sides are parallel.
3. Brit.trapezoid (def. 1a).
2. a bone in the wrist that articulates with the metacarpal bone of the thumb.