| tetragon | 1. <geometry> A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc. 2. <astronomy> 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. Origin: L. Tetragonum, Gr.; (see Tetra-) + corner, angle: cf. F. Tetragone. Source: Websters Dictionary (01 Mar 1998) |
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| tetragonal | 1. <geometry> Of or pertaining to a tetragon; having four angles or sides; thus, the square, the parallelogram, the rhombus, and the trapezium are tetragonal fingers. 2. <botany> Having four prominent longitudinal angles. 3. <chemistry> Designating, or belonging to, a certain system of crystallization; dimetric. See Tetragonal system, under Crystallization. Source: Websters Dictionary (01 Mar 1998) |
| tetragonus | An obsolete term for platysma muscle. (05 Mar 2000) |