Recorded since 1570, learned borrowing from Late Latin trapezium, from Ancient Greek τραπέζιον (trapézion, “irregular quadrilateral”, literally “a little table”), diminutive of τράπεζα (trápeza, “table”). Doublet of trapeze.
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- (geometry, Britain, Australia, New Zealand) A four-sided polygon with two sides 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.
- (geometry): The terms trapezium and trapezoid have swapped meanings in the US and Canada as compared with the rest of the world.
- (archaic) trapeze
- (geometry, British, four-sided polygon with two parallel sides): (US) trapezoid
- (geometry, US, four-sided polygon with no sides parallel and no equal sides): (British) trapezoid, (British) irregular quadrilateral.
- (Classical) IPA(key): /traˈpez.zi.um/, [t̪räˈpɛz̪d̪͡z̪iʊ̃ˑ]
- (Ecclesiastical) IPA(key): /traˈped.d͡zi.um/, [t̪räˈpɛd̪ː͡z̪ium]
Second-declension noun (neuter).
1Found in older Latin (until the Augustan Age).