nounpl. -·zi·ums or -·zia
- a plane figure with four sides, no two of which are parallel
- Brit. trapezoid (sense )
- Anat. a small bone of the wrist near the base of the thumb
Origin of trapeziumLate Latin from Classical Greek trapezion, trapezium, literally , small table, diminutive of trapeza, table, literally , four-footed bench from tra-, for tetra, four + peza, foot; akin to pous, foot
nounpl. tra·pe·zi·ums, or tra·pe·zi·a
- Mathematics a. A quadrilateral having no parallel sides.b. Chiefly British A trapezoid.
- Anatomy A bone in the wrist at the base of the thumb.
Origin of trapeziumOriginally, a quadrilateral with two parallel sides (later confused with trapezoid originally, a quadrilateral having no parallel sides ) from Modern Latin trapezium a quadrilateral with two parallel sides from Late Greek trapezion from Greek diminutive of trapeza table tra- four ; see kwetwer- in Indo-European roots. peza foot ; see ped- in Indo-European roots.
(plural trapeziums or trapezia)
- (geometry, UK) A four-sided polygon with two sides parallel; a trapezoid (modern sense)
- (geometry, US) A four-sided polygon with no parallel sides and no sides equal; a simple convex irregular quadrilateral.
- A bone of the carpus at the base of the first metacarpal, or thumb.
- 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, US, four-sided polygon with no sides parallel and no equal sides): The terms trapezium and trapezoid have partially swapped meanings in the US and Canada as compared with the rest of the world.
Recorded since 1570, from Late Latin trapezium, from Ancient Greek Ï„ÏÎ±Ï€ÎÎ¶Î¹Î¿Î½ (trapezion, “irregular quadrilateral", literally “a little table"), diminutive of Ï„ÏÎ¬Ï€ÎµÎ¶Î± (trapeza, “table")", itself from Ï„ÏÎ¬- (tra-, “four") + Ï€ÎÎ¶Î± (peza, “foot, edge").