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trapezoid

[trap-uh-zoid]

Origin

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noun

Geometry.

a quadrilateral plane figure having two parallel and two nonparallel sides.

British. trapezium (def. 1b).

Anatomy. a bone in the wrist that articulates with the metacarpal bone of the forefinger.

adjective

Also, trap·e·zoi·dal. Geometry. of, pertaining to, or having the form of a trapezoid.

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Trapezoid is always a great word to know.

So is pubis. Does it mean:

lower portion of either innominate bone

part of the innominate bone, with the corresponding part of the other, forms the front of the pelvis

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

Related forms

post·trap·e·zoid, adjective

sub·trap·e·zoid, adjective

sub·trap·e·zoi·dal, adjective

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To trapezoid

Collins

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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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.

EXPAND

But in Eng. since c.1800, often confused with trapezium in its sense of "a quadrilateral figure having only two sides parallel."

COLLAPSE

Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage

Medical Dictionary

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

A quadrilateral having two parallel sides.
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.

American Heritage

Science Dictionary

trapezoid

(trāp'ĭ-zoid') Pronunciation Key
A four-sided plane figure having two parallel sides.

American Heritage

Cultural Dictionary

trapezoid [(trap-uh-zoyd)]

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