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1British Geometry A quadrilateral with no sides parallel.
‘He has invented the trisosceles trapezoid (or trapezium as we say in the UK).’
‘It is also relatively easy to make, as long as you don't get too fussed about perfect trapezoids of bread and the delicate art of construction.’
‘The bold monochrome panels in other works, such as the juxtaposed trapezoids in the Birds Over Loop pieces, are reminiscent of Sean Scully's paintings.’
‘It is not an easy show: a dozen works on paper, single coloured trapezoids, subtle curves and rhomboids, hung sparely in a stark white interior.’
1.1North American A quadrilateral with one pair of sides parallel.
‘Wood blinds, meanwhile, can fit a variety of applications, including quarter arches, full arches, angles, trapezoids, hexagons and triangles.’
‘He arranges thin rectangles, squares, triangles and trapezoids in complex patterns on the wall.’
‘The key elements of our total approach include measurements, models, and data, which are represented by the black squares, trapezoids, and ellipses respectively.’
‘For example, Angel consists of three layers of open triangles, trapezoids, parallelograms and pentagons, once again made of wood.’
‘With their vast knowledge of geometry, they were able to correctly calculate the areas of triangles, rectangles, and trapezoids and the volumes of figures such as bricks, cylinders, and pyramids.’
2Anatomy A small carpal bone in the base of the hand, articulating with the metacarpal of the index finger.
‘Climbing mostly builds muscles that pull (forearms, lats, trapezoids, biceps) while demanding less of those that push (shoulders, pectorals, triceps).’
‘Complete dislocation of the acromioclavicular joint with avulsion of the trapezoid and deltoid muscle results in a decrease in upper extremity strength.’
‘During surgery, we observed partial or complete detachment of the trapezoid and deltoid muscles from the lateral clavicle in all patients.’
‘The distal row of carpals includes the hamate, capitate, trapezium, and trapezoid, which are closely approximated to the metacarpals.’
‘A mass of muscle would pop up: deltoids would ripple, trapezoids bunch and gloots clench.’
Origin
Early 18th century: from modern Latin trapezoides, from late Greek trapezoeidēs, from trapeza ‘table’ (see trapezium).