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See more synonyms for parallelogram on Thesaurus.com
  1. a quadrilateral having both pairs of opposite sides parallel to each other.
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Origin of parallelogram

1560–70; < Late Latin parallēlogrammum < Greek parallēlógrammon. See parallel, -o-, -gram1
Related formspar·al·lel·o·gram·mat·ic [par-uh-lel-uh-gruh-mat-ik] /ˌpær əˌlɛl ə grəˈmæt ɪk/, par·al·lel·o·gram·mat·i·cal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

square, rectangle, parallelogram, quadrilateral, rhombus, plane, figure, oblong

Examples from the Web for parallelogram

Historical Examples

  • The tables at which the guests are seated form three sides of a parallelogram.

    Six Centuries of Painting

    Randall Davies

  • From shoulders to the ground he was in the form of a parallelogram.

    The Kentucky Ranger

    Edward T. Curnick

  • The plan is a parallelogram, with a semicircle at the further end.

    The Western World

    W.H.G. Kingston

  • These lines formed a parallelogram about three feet in length by two in breadth.

    Ran Away to Sea

    Mayne Reid

  • This day come home the instrument I have so long longed for, the Parallelogram.

British Dictionary definitions for parallelogram


  1. a quadrilateral whose opposite sides are parallel and equal in lengthSee also rhombus, rectangle, trapezium, trapezoid
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Word Origin

C16: via French from Late Latin, from Greek parallēlogrammon, from parallēlos parallel + 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

Word Origin and History for parallelogram


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).

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Online Etymology Dictionary, © 2010 Douglas Harper

parallelogram in Science


  1. A four-sided plane figure with opposite sides parallel. Rhombuses and rectangles are parallelograms.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.