trapezoidal

trapezoid

[trap-uh-zoid]
noun
1.
Geometry.
a.
a quadrilateral plane figure having two parallel and two nonparallel sides.
b.
British, trapezium ( def 1b ).
2.
Anatomy. a bone in the wrist that articulates with the metacarpal bone of the forefinger.
adjective
3.
Also, trapezoidal. Geometry. of, pertaining to, or having the form of a trapezoid.

Origin:
1695–1705; < Neo-Latin trapezoīdēs < Late Greek trapezoeidḗs trapeziumlike. See trapezium, -oid

posttrapezoid, adjective
subtrapezoid, adjective
subtrapezoidal, adjective
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World English Dictionary
trapezoid (ˈtræpɪˌzɔɪd)
 
n
1.  a quadrilateral having neither pair of sides parallel
2.  (US), (Canadian) Also called: trapezium a quadrilateral having two parallel sides of unequal length
3.  a small bone of the wrist near the base of the index finger
 
[C18: from New Latin trapezoidēs, from Late Greek trapezoeidēs trapezium-shaped, from trapeza table]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

trapezoid
1706, "a trapezium," from Mod.L. trapezoides, from Late Gk. trapezoeides (Proclus), special use by Euclid of Gk. trapezoeides "trapezium-shaped," from trapeza, lit. "table" (see trapezium), + -oeides "shaped." Technically, a quadrilateral figure with no two sides parallel.
But in Eng. since c.1800, often confused with trapezium in its sense of "a quadrilateral figure having only two sides parallel."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

trapezoid trap·e·zoid (trāp'ĭ-zoid')
n.

  1. A quadrilateral having two parallel sides.

  2. A small bone in the wrist situated near the base of the index finger and articulating with the second metacarpal, trapezium, capitate, and scaphoid bones.


trap'e·zoid' or trap'e·zoi'dal (-zoid'l) adj.
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
trapezoid   (trāp'ĭ-zoid')  Pronunciation Key 
A four-sided plane figure having two parallel sides.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
trapezoid [(trap-uh-zoyd)]

A four-sided polygon in which two sides are parallel and two are not.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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