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parallelogram

[par-uh-lel-uh-gram] /ˌpær əˈlɛl əˌgræm/
noun
1.
a quadrilateral having both pairs of opposite sides parallel to each other.
Origin
1560-1570
1560-70; < Late Latin parallēlogrammum < Greek parallēlógrammon. See parallel, -o-, -gram1
Related forms
parallelogrammatic
[par-uh-lel-uh-gruh-mat-ik] /ˌpær əˌlɛl ə grəˈmæt ɪk/ (Show IPA),
parallelogrammatical, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for parallelogram

parallelogram

/ˌpærəˈlɛləˌɡræm/
noun
1.
a quadrilateral whose opposite sides are parallel and equal in length See also rhombus, rectangle, trapezium, trapezoid
Word Origin
C16: via French from Late Latin, from Greek parallēlogrammon, from parallēlosparallel + grammē line, related to graphein to write
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 parallelogram
n.

1560s, from Middle French parallélogramme (1550s) and directly from Late Latin parallelogrammum, from Greek parallelogrammon noun use of neuter adjective meaning "bounded by parallel lines," from parallelos (see parallel) + stem of graphein "to write" (see -graphy).

Online Etymology Dictionary, © 2010 Douglas Harper
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parallelogram in Science
parallelogram
  (pār'ə-lěl'ə-grām')   
A four-sided plane figure with opposite sides parallel. Rhombuses and rectangles are parallelograms.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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