a parallelogram having four right angles.

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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rectangle (ˈrɛkˌtæŋɡəl)
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

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 for rectangles
Generally, tables are rectangles twice as long as they are wide.
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