tetragon
四角形
tetragon
四邊形
Tet·ra·gon n.
1. Geom. 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.
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tetragon
n : a four-sided polygon [syn: quadrilateral, quadrangle]