TETRAGON

tetragon. Tetragon, n. a figure of fodur sides, a square aspect

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Tet″ra‐gon (?), n. [[L. tetragonum, Gr. τετράγωνον; τέτρα- (see Tetra-) + γωνία corner, angle: cf. F. tétragone.]] 1. 1. (Geom.) A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc.
2. 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.