a quadrilateral having both pairs of opposite sides parallel to each other.

Nearby words

  1. paralleling,
  2. parallelism,
  3. parallelist,
  4. parallelistic,
  5. parallelize,
  6. parallelogram law,
  7. parallelogram rule,
  8. parallergic,
  9. paralogia,
  10. paralogism

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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for parallelogram

British Dictionary definitions for parallelogram



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

Word Origin for parallelogram

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).

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for parallelogram



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