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rectangle

[rek-tang-guh l]
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noun
  1. a parallelogram having four right angles.
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Origin of rectangle

1565–75; < Medieval Latin rēctangulum, Late Latin rēctiangulum right-angled triangle (noun use of neuter of rēctiangulus having a right angle), equivalent to rēcti- recti- + angulum angle1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for rectangle

rectangle

noun
  1. a parallelogram having four right anglesCompare rhombus
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Word Origin

C16: from Medieval Latin rectangulum, from Latin rectus straight + angulus angle
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 rectangle

n.

1570s, from Middle French rectangle (16c.) and directly from Late Latin rectangulum, from rect-, comb. form of Latin rectus "right" (see right (adj.1)) + Old French angle (see angle (n.)). Medieval Latin rectangulum meant "a triangle having a right angle."

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Online Etymology Dictionary, © 2010 Douglas Harper

rectangle in Science

rectangle

[rĕktăng′gəl]
  1. A four-sided plane figure with four right angles.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.