a polygon having four angles or sides; a quadrangle or quadrilateral.

1620–30; < Greek tetrágōnon. See tetra-, -gon

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World English Dictionary
tetragon (ˈtɛtrəˌɡɒn)
a less common name for quadrilateral
[C17: from Greek tetragōnon; see tetra-, -gon]

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Example sentences
The unit cell of indium's crystal structure is an unusual face-centered tetragon.
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