tetragon
NounOpen English WordNet
Noun (1)
- a four-sided polygonSynonyms: quadrilateralquadrangleType of polygon, polygonal shapeKinds trapezium, trapezoid, parallelogram
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Webster's Dictionary (1913)
Tet′ra·gon noun
Origin: L. tetragonum, Gr. τετράγωνον; τέτρα- (see Tetra-) + γωνία corner, angle: cf. F. tétragone.
1. Geometry A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc.
2. Astrol. 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. Charles Hutton
Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54