the world > relative properties > number > geometry > shape or figure > [noun] > two-dimensional > quadrilateral > irregular > with no parallel sides (2)
Geometry. A quadrilateral figure no two of whose sides are parallel. (Often called by English writers (in 19th cent.) trapezium, n.)
Geometry. An irregular quadrilateral having neither pair of opposite sides parallel. (The usual sense in England from 1800 to 1875. Now rare. This…