tetragon
American Heritage Dictionary:
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tet·ra·gon
(tĕt'rə-gŏn') 
n.
A four-sided polygon; a quadrilateral.
tetragonally te·trag'o·nal·ly adv.
n.
A four-sided polygon; a quadrilateral.
[Late Latin tetragōnum, from Greek tetragōnon : tetra-, tetra- + -gōnon, -gon.]
tetragonal te·trag'o·nal (tĕ-trăg'ə-nəl) adj.tetragonally te·trag'o·nal·ly adv.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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