Trapezium definition

trə-pēzē-əm
(geometry, US) A four-sided polygon with no parallel sides and no sides equal; a simple convex irregular quadrilateral.
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(anatomy) A bone in the wrist at the base of the thumb.
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A quadrilateral having no parallel sides.
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(chiefly british) A trapezoid.
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A four-sided plane figure having no parallel sides.
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(geometry, UK) A four-sided polygon with two sides parallel; a trapezoid (modern sense)
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A bone of the carpus at the base of the first metacarpal, or thumb.
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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.
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A plane figure with four sides, no two of which are parallel.
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(anat.) A small bone of the wrist near the base of the thumb.
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(anatomy) A bone in the wrist at the base of the thumb.
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Other Word Forms

Noun

Singular:
trapezium
Plural:
trapezia, trapeziums

Origin of trapezium

  • Originally, 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 kwetwer- in Indo-European roots peza foot ped- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • Recorded since 1570, from Late Latin trapezium, from Ancient Greek τραπέζιον (trapezion, “irregular quadrilateral", literally “a little table"), diminutive of τράπεζα (trapeza, “table")", itself from τρά- (tra-, “four") + πέζα (peza, “foot, edge").

    From Wiktionary