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Focus on an offensive lineman, defensive lineman or linebacker: they almost always begin inside the television tetragon.

Thus we speak of a pentagon but not of a tetragon or a trigon, although both words are correct in form.

Just a great big tetragon on a central pivot.

A figure that is bounded by four straight lines is termed a quadrangle, quadrilateral or tetragon.

Associated word: quadrigenarious. four-sided, a. quadrangular, square, quadrilateral, tetragonal, tetrahedral. four-sided figure. square, tetragon, quadrangle, rhombus. foursquare, a. quadrangular. fourth, n. quarter. four years, quadrennium.