[ truh-pee-zee-uh m ]
/ trəˈpi zi əm /

noun, plural tra·pe·zi·ums, tra·pe·zi·a [truh-pee-zee-uh] /trəˈpi zi ə/.

  1. (in Euclidean geometry) any rectilinear quadrilateral plane figure not a parallelogram.
  2. a quadrilateral plane figure of which no two sides are parallel.
  3. British. trapezoid(def 1a).
Anatomy. a bone in the wrist that articulates with the metacarpal bone of the thumb.


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Origin of trapezium

1545–55; < New Latin < Greek trapézion kind of quadrilateral, literally, small table, equivalent to trápez(a) table (shortening of *tetrapeza object having four feet, equivalent to tetra- four + péza foot, akin to poús, podós; see tetra-, foot) + -ion diminutive suffix


tra·pe·zi·al, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for trapezium

British Dictionary definitions for trapezium

/ (trəˈpiːzɪəm) /

noun plural -ziums or -zia (-zɪə)

mainly British a quadrilateral having two parallel sides of unequal lengthUsual US and Canadian name: trapezoid
mainly US and Canadian a quadrilateral having neither pair of sides parallel
a small bone of the wrist near the base of the thumb

Derived forms of trapezium

trapezial, adjective

Word Origin for trapezium

C16: via Late Latin from Greek trapezion, from trapeza table
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for trapezium

[ trə-pēzē-əm ]

n. pl. tra•pe•zi•ums

A quadrilateral having no parallel sides.
A bone in the wrist at the base of the thumb, articulating with the first and second metacarpal, scaphoid, and trapezoid bones.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for trapezium

[ trə-pēzē-əm ]

Plural trapeziums trapezia

A four-sided plane figure having no parallel sides.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.