• synonyms


[truh-pee-zee-uh m]
noun, plural tra·pe·zi·ums, tra·pe·zi·a [truh-pee-zee-uh] /trəˈpi zi ə/.
  1. Geometry.
    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).
  2. 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
Related formstra·pe·zi·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for trapezial


noun plural -ziums or -zia (-zɪə)
  1. mainly British a quadrilateral having two parallel sides of unequal lengthUsual US and Canadian name: trapezoid
  2. mainly US and Canadian a quadrilateral having neither pair of sides parallel
  3. a small bone of the wrist near the base of the thumb
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Derived Formstrapezial, adjective

Word Origin

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

Word Origin and History for trapezial



1560s, from Late Latin trapezium, from Greek trapezion "irregular quadrilateral," literally "a little table," diminutive of trapeza "table," from tra- "four" (see four) + peza "foot, edge," related to pous (see foot (n.)). Before 1540s, Latin editions of Euclid used the Arabic word helmariphe. As the name of a bone in the wrist, it is recorded from 1840.

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Online Etymology Dictionary, © 2010 Douglas Harper

trapezial in Medicine


  1. Relating to a trapezium or to the trapezius muscle.
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n. pl. tra•pe•zi•ums
  1. A quadrilateral having no parallel sides.
  2. A bone in the wrist at the base of the thumb, articulating with the first and second metacarpal, scaphoid, and trapezoid bones.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

trapezial in Science


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