rectangle

[rek-tang-guhl]
noun
a parallelogram having four right angles.

Origin:
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

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World English Dictionary
rectangle (ˈrɛkˌtæŋɡəl)
 
n
Compare rhombus a parallelogram having four right angles
 
[C16: from Medieval Latin rectangulum, from Latin rectus straight + angulus angle]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

rectangle
1571, from M.Fr. rectangle, from rect-, comb. form of L. rectus "right" + O.Fr. angle (see angle). M.L. rectangulum meant "a triangle having a right angle" (7c.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
rectangle   (rěk'tāng'gəl)  Pronunciation Key 
A four-sided plane figure with four right angles.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Turn onto lightly floured surface and pat into shape of small rectangle.
Each test involved a jazzy rectangle crossing the screen either before or after
  a plain one.
Use these dimensions to cut a rectangle from the paper you are recycling.
You'll need a mighty big spaceship to make that rectangle.
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