noun, plural trapeziums, trapezia [truh-pee-zee-uh] .
(in Euclidean geometry) any rectilinear quadrilateral plane figure not a parallelogram.
a quadrilateral plane figure of which no two sides are parallel.
British, trapezoid ( def 1a ).
Anatomy. a bone in the wrist that articulates with the metacarpal bone of the thumb.

1545–55; < Neo-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

trapezial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trapezium (trəˈpiːzɪəm)
n , pl -ziums, -zia
1.  chiefly (Brit) Usual US and Canadian name: trapezoid a quadrilateral having two parallel sides of unequal length
2.  chiefly (US), (Canadian) a quadrilateral having neither pair of sides parallel
3.  a small bone of the wrist near the base of the thumb
[C16: via Late Latin from Greek trapezion, from trapeza table]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1570, from L.L. trapezium, from Gk. trapezion "irregular quadrilateral," lit. "a little table," dim. of trapeza "table," from tra- "four" (see four) + peza "foot, edge," related to pous (see foot). Before 1546, L. editions of Euclid used the Arabic
word helmariphe. As the name of a bone in the wrist, it is recorded from 1840.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

trapezium tra·pe·zi·um (trə-pē'zē-əm)
n. pl. tra·pe·zi·ums or tra·pe·zi·a (-zē-ə)

  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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
trapezium   (trə-pē'zē-əm)  Pronunciation Key 
Plural trapeziums or trapezia
A four-sided plane figure having no parallel sides.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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