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trapezoid

[trap-uh-zoid] /ˈtræp əˌzɔɪd/
noun
1.
Geometry.
  1. a quadrilateral plane figure having two parallel and two nonparallel sides.
  2. 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, relating to, or having the form of a trapezoid.
Origin of trapezoid
1695-1705
1695-1705; < New Latin trapezoīdēs < Late Greek trapezoeidḗs trapeziumlike. See trapezium, -oid
Related forms
posttrapezoid, adjective
subtrapezoid, adjective
subtrapezoidal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for trapezoid
Historical Examples
  • The term "isosceles trapezoid" is used to mean a trapezoid with two opposite sides equal, but not parallel.

    The Teaching of Geometry David Eugene Smith
  • The area of a trapezoid is equal to half the sum of its bases multiplied by the altitude.

    The Teaching of Geometry David Eugene Smith
  • trapezoid -al: a four-sided plane of which two sides are parallel and two are not.

  • An interesting variation of the ordinary proof is made by placing a trapezoid T', congruent to T, in the position here shown.

    The Teaching of Geometry David Eugene Smith
  • In the first drawer I keep the four plain wooden squares and two frames, one containing a rhomboid, and the other a trapezoid.

    The Montessori Method Maria Montessori
  • The trapezoid and the os magnum of the carpus are united, while in Choloepus they are perfectly distinct bones.

  • It has a rugose, tuberculated body of trapezoid form, the colors being brown and reddish, while the whole aspect is crab-like.

  • To find the area of a trapezoid: Multiply half the sum of the two parallel sides by the distance between them.

    Getting Gold J. C. F. Johnson
  • The second trapezoid is composed of pieces which can be placed in the rectangle, filling it completely.

  • Another drawer contains various figures: an oval, an ellipse, a rhombus, and a trapezoid.

British Dictionary definitions for trapezoid

trapezoid

/ˈtræpɪˌzɔɪd/
noun
1.
a quadrilateral having neither pair of sides parallel
2.
(US & Canadian) Also called (Brit, Austral., NZ, and South African) trapezium. a quadrilateral having two parallel sides of unequal length
3.
a small bone of the wrist near the base of the index finger
Word Origin
C18: from New Latin trapezoidēs, from Late Greek trapezoeidēs trapezium-shaped, 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
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Word Origin and History for trapezoid
n.

1706, "a trapezium," from Modern Latin trapezoides, from Late Greek trapezoeides (Proclus), special use by Euclid of Greek trapezoeides "trapezium-shaped," from trapeza, literally "table" (see trapezium), + -oeides "shaped" (see -oid). Technically, a quadrilateral figure with no two sides parallel. But in English 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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trapezoid in Medicine

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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trapezoid in Science
trapezoid
  (trāp'ĭ-zoid')   
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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trapezoid in Culture
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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