trapezium

IPA: trʌpˈiziʌm

(geometry, Britain, Australia, New Zealand) A quadrilateral with two sides parallel.
(restrictively) A quadrilateral with two sides parallel and two sides non-parallel.
(geometry, US, dated) A four-sided polygon with no parallel sides and no sides equal; a simple convex irregular quadrilateral.
(anatomy) The trapezium bone of the wrist.
A region on the ventral side of the brain, either just back of the pons Varolii, or, as in man, covered by the posterior extension of its transverse fibers.

Examples of "trapezium" in Sentences

The shape was a pentagon trapezium.
A trapezium, and hence also a rectangle, is convex.
The positions of the scaphoid, trapezium and hamate.
The second metacarpal is connected to the trapezium.
The badge is a horizontal oval above an inverted trapezium.
But a square is a special case of a 3 sides equal trapezium.
The distal convex surface articulates with trapezium and trapezoid.
It it based on the fact that the trapezium has the same area as the hexagon.
An example of such a system is the Trapezium in the heart of the Orion nebula.
Sometimes, however, in certain varieties of horses the trapezium is developed, but then it is no more than a very small osseous nodule.