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.
A quadrilateral with two sides parallel and two sides non-parallel.
A quadrilateral with two sides parallel.
The trapezoid bone of the wrist.
A (convex) quadrilateral with two (non-adjacent) parallel sides.
A convex quadrilateral with no sides parallel.