
1) Parallelogram 2) Quadrangle 3) Trapezium 4) Trapezoid 5) Trapezoidal
Found on
https://www.crosswordclues.com/clue/tetragon

1) Polygon 2) Polygonal shape 3) Quadrangle 4) Quadrilateral 5) Rhombus
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https://www.crosswordclues.com/clue/tetragon

• (n.) An aspect of two planets with regard to the earth when they are distant from each other ninety degrees, or the fourth of a circle. • (n.) A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc.
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http://thinkexist.com/dictionary/meaning/tetragon/

1. <geometry> A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc. ... 2. <astronomy> An aspect of two planets with regard to the earth when they are distant from each other ninety degrees, or the fourth of a circle. ... Origin: L. Tetragonum, Gr.; (see Tetra-) + corner, angle: cf. F. Tetragone. ... So...
Found on
http://www.encyclo.co.uk/local/20973
Tet'ra·gon noun [ Latin
tetragonum , Greek
tetra`gwnon ;
te`tra- (see
Tetra- ) +
gwni`a corner, angle: confer French
tétragone .]
1. (Geom.) A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc. ...
Found on
http://www.encyclo.co.uk/webster/T/34

Type: Term Pronunciation: tet′ră-gon, tet′ră-gō′nŭm Definitions: 1. Quadrangle; a figure having four sides.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=91037

A tetragon (from the Greek tetra meaning four and gonia, meaning corner or angle) is a plane figure having four angles. Thus a square, a rectangle and a parallelogram are all forms of tetragon.
Found on
http://www.probertencyclopaedia.com/browse/GT.HTM
No exact match found.