tetragon
n. நாற்கோணம், நாற்சட்டம்.
Tet"ra*gon, n. Etym: [L. tetragonum, Gr. Tetra-) + tétragone.] 1. (Geom.) Defn: A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc. 2. (Astrol.) Defn: 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. Hutton.