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(), n.[L. tetragonum, Gr. tetra°gwnon; te°tra- (see Tetra-) + gwni°a corner, angle: cf. F. ttragone.] 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. Hutton. スポンサード リンク
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